Casio Calculator CFX 9850GB PLUS User Manual

fx-9750G PLUS  
CFX-9850G PLUS  
CFX-9850GB PLUS  
CFX-9850GC PLUS  
CFX-9950GB PLUS  
User’s Guide  
E
 
BEFORE USING THE CALCULATOR  
FOR THE FIRST TIME...  
Be sure to perform the following procedure to load batteries, reset the calculator, and  
adjust the contrast before trying to use the calculator for the first time.  
1. Making sure that you do not accidently press the o key, attach the case to the  
calculator and then turn the calculator over. Remove the back cover from the calculator  
by pulling with your finger at the point marked 1.  
1
2. Load the four batteries that come with calculator.  
Make sure that the positive (+) and negative (–) ends of the batteries are facing  
correctly.  
BACK UP  
3. Remove the insulating sheet at the location marked “BACK UP” by pulling in the  
direction indicated by the arrow.  
BACK UP  
4. Replace the back cover, making sure that its tabs enter the holes marked 2 and turn  
the calculator front side up. The calculator should automatically turn on power and  
perform the memory reset operation.  
2
i
 
5. Press m.  
* The above shows the CFX-9850  
(9950)G(B) PLUS screen.  
* The above shows the fx-9750G  
PLUS screen.  
If the Main Menu shown above is not on the display,  
press the P button on the back of the calculator to  
perform memory reset.  
P button  
6. Use the cursor keys (f, c, d, e) to select the CONT icon and press  
E
c
w or simply press  
to display the contrast adjustment screen.  
CFX-9850(9950)GB PLUS,  
CFX-9850G PLUS  
fx-9750G PLUS  
7. Adjust the contrast.  
uTo adjust the contrast  
Use f and c to move the pointer to CONTRAST.  
CFX  
Press e to make the figures on the display darker, and d to make them  
lighter.  
uTo adjust the tint  
CFX  
1. Use f and c to move the pointer to the color you want to adjust (ORANGE,  
BLUE, or GREEN).  
2. Press e to add more green to the color, and d to add more orange.  
8. To exit display contrast adjustment, press m.  
ii  
 
ABOUT THE COLOR DISPLAY  
CFX  
The display uses three colors: orange, blue, and green, to make data easier to  
understand.  
• Main Menu  
• Display Color Adjustment  
• Graph Function Menu  
• Graph Display (Example 1)  
• Graph-To-Table Display  
• Table & Graph Numeric Table  
• Graph Display (Example 2)  
• Dynamic Graph Display  
• Recursion Formula Convergence/  
Divergence Graph Example  
iii  
 
• Statistical Regression Graph Example  
CFX  
When you draw a graph or run a program, any comment text normally appears  
on the display in blue. You can, however, change the color of comment text to  
orange or green.  
Example: To draw a sine curve  
1. Enter the GRAPH Mode and input the following.  
3(TYPE)1(Y=)  
(Specifies rectangular coordinates.)  
4
svwf  
5
(Stores the expression.)  
2. 4(COLR)  
2
3456  
Press the function key that corresponds to the color you want to use for the  
graph:  
1 for blue, 2 for orange, 3 for green.  
3. 2(Orng)  
(Specifies the graph color.)  
6
J
4.6(DRAW)  
(Draws the graph)  
You can also draw multiple graphs of different color on the same screen, making  
each one distinct and easy to view.  
iv  
 
KEYS  
Alpha Lock  
Normally, once you press a and then a key to input an alphabetic character, the key-  
board reverts to its primary functions immediately. If you press ! and then a, the  
keyboard locks in alpha input until you press a again.  
v
 
KEY TABLE  
Page  
128  
Page  
132  
Page  
113  
Page  
154  
Page  
144  
Page  
120  
369  
28  
4
3
2
2
27  
47  
46  
47  
46  
46  
46  
45  
45  
47  
36  
45  
45  
45  
45  
46  
46  
47  
36  
49  
49  
49  
22  
Page  
Page  
Page  
Page  
Page  
21  
20  
36  
36  
36  
36  
45  
36  
39  
36  
vi  
 
Quick-Start  
Turning Power On And Off  
Using Modes  
Basic Calculations  
Replay Features  
Fraction Calculations  
Exponents  
Graph Functions  
Dual Graph  
Box Zoom  
Dynamic Graph  
Table Function  
 
Quick-Start  
Welcome to the world of graphing calculators.  
Quick-Start is not a complete tutorial, but it takes you through many of the most common  
functions, from turning the power on, to specifying colors, and on to graphing complex  
equations. When you’re done, you’ll have mastered the basic operation of this calculator and  
will be ready to proceed with the rest of this user’s guide to learn the entire spectrum of  
functions available.  
Each step of the examples in Quick-Start is shown graphically to help you follow along  
quickly and easily. When you need to enter the number 57, for example, we’ve indicated it  
as follows:  
Press fh  
Whenever necessary, we’ve included samples of what your screen should look like.  
If you find that your screen doesn’t match the sample, you can restart from the beginning  
by pressing the “All Clear” button o.  
TURNING POWER ON AND OFF  
To turn power on, press o.  
OFF  
o
To turn power off, press !  
.
Note that the calculator automatically turns power off if you do not perform any operation  
for about six minutes (about 60 minutes when a calculation is stopped by an output  
command (^)).  
USING MODES  
This calculator makes it easy to perform a wide range of calculations by simply selecting  
the appropriate mode. Before getting into actual calculations and operation examples, let’s  
take a look at how to navigate around the modes.  
To select the RUN Mode  
1. Press m to display the Main Menu.  
* The above shows the CFX-9850  
(9950)G(B) PLUS screen.  
viii  
 
Quick-Start  
2. Use defc to highlight RUN and then  
press w.  
This is the initial screen of the RUN mode, where you  
can perform manual calculations, and run programs.  
BASIC CALCULATIONS  
With manual calculations, you input formulas from left to right, just as they are written on  
paper. With formulas that include mixed arithmetic operators and parentheses, the calcula-  
tor automatically applies true algebraic logic to calculate the result.  
Example: 15 × 3 + 61  
1. Press o to clear the calculator.  
2. Pressbf*d+gbw.  
Parentheses Calculations  
Example: 15 × (3 + 61)  
1. Pressbf*(d  
+gb)w.  
Built-In Functions  
This calculator includes a number of built-in scientific functions, including trigonometric  
and logarithmic functions.  
Example: 25 × sin 45˚  
Important!  
Be sure that you specify Deg (degrees) as the angle unit before you try this  
example.  
ix  
 
Quick-Start  
1. Presso.  
SET UP  
mto switch the set up display.  
2. Press!  
3. Presscccc1 (Deg) to specify  
degrees as the angle unit.  
4. PressJ to clear the menu.  
5. Presso to clear the unit.  
6. Presscf*sefw.  
REPLAY FEATURES  
With the replay feature, simply press d or e to recall the last calculation that was  
performed. This recalls the calculation so you can make changes or re-execute it as it is.  
Example: To change the calculation in the last example from (25 × sin 45˚) to (25 × sin  
55˚)  
1. Press d to display the last calculation.  
2. Press d twice to move the cursor under the 4.  
3. Press f.  
4. Press w to execute the calculation again.  
x
 
Quick-Start  
FRACTION CALCULATIONS  
You can use the $ key to input fractions into calculations. The symbol “ { ” is used  
to separate the various parts of a fraction.  
37  
Example: 1 15  
/
+
/
9
16  
1. Presso.  
2. Pressb$bf$  
bg+dh$  
jw.  
Indicates 6 7/144  
Converting a Mixed Fraction to an Improper Fraction  
d/c  
$
While a mixed fraction is shown on the display, press !  
to convert it to an  
improper fraction.  
d/c  
$
Press !  
again to convert back to a mixed fraction.  
Converting a Fraction to Its Decimal Equivalent  
While a fraction is shown on the display, press M to convert it to its decimal equiva-  
lent.  
Press M again to convert back to a fraction.  
xi  
 
Quick-Start  
EXPONENTS  
Example: 1250 × 2.065  
1. Presso.  
2. Pressbcfa*c.ag.  
3. PressM and the ^ indicator appears on the display.  
4. Pressf. The ^5 on the display indicates that 5 is  
an exponent.  
5. Pressw.  
xii  
 
Quick-Start  
GRAPH FUNCTIONS  
The graphing capabilities of this calculator makes it possible to draw complex graphs  
using either rectangular coordinates (horizontal axis: x ; vertical axis: y) or polar coordi-  
nates (angle: θ ; distance from origin: r).  
Example 1: To graph Y = X(X + 1)(X – 2)  
1. Press m.  
2. Use d, e, f, and c to highlight GRAPH,  
and then press w.  
3. Input the formula.  
v(v+b)  
(v-c)w  
4. Press 6 (DRAW) or w to draw the graph.  
Example 2: To determine the roots of Y = X(X + 1)(X – 2)  
1. Press ! 5 (G-Solv).  
1
xiii  
 
Quick-Start  
2. Press 1 (ROOT).  
Press e for other roots.  
Example 3: Determine the area bounded by the origin and the X = –1 root obtained for  
Y = X(X + 1)(X – 2)  
1. Press !5 (G-Solv).  
6
12345  
2. Press 6 (g).  
3
12 456  
3. Press 3 (dx).  
4. Use dto move the pointer to the location where  
X = –1, and then press w. Next, use e to  
move the pointer to the location where X = 0, and  
then press  
to input the integration range, which  
w
becomes shaded on the display.  
xiv  
 
Quick-Start  
DUAL GRAPH  
With this function you can split the display between two areas and display two graphs  
on the same screen.  
Example: To draw the following two graphs and determine the points of intersection  
Y1 = X(X + 1)(X – 2)  
Y2 = X + 1.2  
1. Press !Zcc1(Grph) to specify  
“Graph” for the Dual Screen setting.  
1
23456  
2. Press J, and then input the two functions.  
v(v+b)  
(v-c)w  
v+b.cw  
3. Press 6 (DRAW) or w to draw the graphs.  
BOX ZOOM  
Use the Box Zoom function to specify areas of a graph for enlargement.  
1. Press ! 2 (Zoom) 1 (BOX).  
2. Use d, e, f, and c to move the pointer  
to one corner of the area you want to specify and then  
press  
.
w
xv  
 
Quick-Start  
3. Use d, e, f, and cto move the pointer  
again. As you do, a box appears on the display. Move  
the pointer so the box encloses the area you want to  
enlarge.  
4. Press w, and the enlarged area appears in the  
inactive (right side) screen.  
DYNAMIC GRAPH  
Dynamic Graph lets you see how the shape of a graph is affected as the value assigned  
to one of the coefficients of its function changes.  
Example: To draw graphs as the value of coefficient A in the following function changes  
from 1 to 3  
Y = AX2  
1. Press m.  
2. Use d, e, f, and c to highlight DYNA,  
and then press w.  
3. Input the formula.  
aAvxw  
4
12356  
xvi  
 
Quick-Start  
4. Press 4 (VAR) bw to assign an initial value  
of 1 to coefficient A.  
2
1
3456  
5. Press 2 (RANG) bwdwbw  
to specify the range and increment of change in  
coefficient A.  
6. Press J.  
7. Press 6(DYNA) to start Dynamic Graph drawing.  
The graphs are drawn 10 times.  
↓↑  
↓↑  
xvii  
 
Quick-Start  
TABLE FUNCTION  
The Table Function makes it possible to generate a table of solutions as different values  
are assigned to the variables of a function.  
Example: To create a number table for the following function  
Y = X (X+1) (X–2)  
1. Press m.  
2. Use d, e, f, and c to highlight TABLE,  
and then press w.  
3. Input the formula.  
v(v+b)  
(v-c)w  
4. Press 6 (TABL) or w to generate the number  
table.  
To learn all about the many powerful features of this calculator, read on and explore!  
xviii  
 
Handling Precautions  
• Your calculator is made up of precision components. Never try to take it apart.  
• Avoid dropping your calculator and subjecting it to strong impact.  
• Do not store the calculator or leave it in areas exposed to high temperatures or humidity, or large  
amounts of dust. When exposed to low temperatures, the calculator may require more time to  
display results and may even fail to operate. Correct operation will resume once the calculator is  
brought back to normal temperature.  
• The display will go blank and keys will not operate during calculations. When you are operating the  
keyboard, be sure to watch the display to make sure that all your key operations are being performed  
correctly.  
• Replace the main batteries once every 2 years regardless of how much the calculator is used during  
that period. Never leave dead batteries in the battery compartment. They can leak and damage the  
unit.  
• Keep batteries out of the reach of small children. If swallowed, consult with a physician immediately.  
• Avoid using volatile liquids such as thinner or benzine to clean the unit. Wipe it with a soft, dry cloth,  
or with a cloth that has been dipped in a solution of water and a neutral detergent and wrung out.  
• Always be gentle when wiping dust off the display to avoid scratching it.  
• In no event will the manufacturer and its suppliers be liable to you or any other person for any  
damages, expenses, lost profits, lost savings or any other damages arising out of loss of data and/or  
formulas arising out of malfunction, repairs, or battery replacement. The user should prepare  
physical records of data to protect against such data loss.  
• Never dispose of batteries, the liquid crystal panel, or other components by burning them.  
• When the “Low battery!” message appears on the display, replace the main power supply batteries  
as soon as possible.  
• Be sure that the power switch is set to OFF when replacing batteries.  
• If the calculator is exposed to a strong electrostatic charge, its memory contents may be damaged or  
the keys may stop working. In such a case, perform the Reset operation to clear the memory and  
restore normal key operation.  
• If the calculator stops operating correctly for some reason, use a thin, pointed object to press the P  
button on the back of the calculator. Note, however, that this clears all the data in calculator memory.  
• Note that strong vibration or impact during program execution can cause execution to stop or can  
damage the calculator’s memory contents.  
• Using the calculator near a television or radio can cause interference with TV or radio reception.  
• Before assuming malfunction of the unit, be sure to carefully reread this user’s guide and ensure that  
the problem is not due to insufficient battery power, programming or operational errors.  
xix  
 
Be sure to keep physical records of all important data!  
The large memory capacity of the unit makes it possible to store large amounts of data. You should  
note, however, that low battery power or incorrect replacement of the batteries that power the unit can  
cause the data stored in memory to be corrupted or even lost entirely. Stored data can also be  
affected by strong electrostatic charge or strong impact.  
Since this calculator employs unused memory as a work area when performing its internal calcula-  
tions, an error may occur when there is not enough memory available to perform calculations. To avoid  
such problems, it is a good idea to leave 1 or 2 kbytes of memory free (unused) at all times.  
In no event shall CASIO Computer Co., Ltd. be liable to anyone for special, collateral, incidental, or  
consequential damages in connection with or arising out of the purchase or use of these materials.  
Moreover, CASIO Computer Co., Ltd. shall not be liable for any claim of any kind whatsoever against  
the use of these materials by any other party.  
• The contents of this user’s guide are subject to change without notice.  
• No part of this user’s guide may be reproduced in any form without the express written consent of  
the manufacturer.  
• The options described in Chapter 21 of this user’s guide may not be available in certain  
geographic areas. For full details on availability in your area, contact your nearest CASIO dealer  
or distributor.  
xx  
 
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fx-9750G PLUS  
CFX-9850G PLUS  
CFX-9850GB PLUS  
CFX-9850GC PLUS  
CFX-9950GB PLUS  
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Contents  
Getting Acquainted — Read This First! ............................................................. 1  
1. Key Markings ....................................................................................................... 2  
2. Selecting Icons and Entering Modes.................................................................... 3  
3. Display ................................................................................................................. 8  
4. Contrast Adjustment ........................................................................................... 11  
5. When you keep having problems... .................................................................... 12  
Chapter 1 Basic Operation ............................................................................. 13  
1-1  
1-2  
1-3  
1-4  
1-5  
Before Starting Calculations... ..................................................................... 14  
Memory ....................................................................................................... 22  
Option (OPTN) Menu .................................................................................. 27  
Variable Data (VARS) Menu ........................................................................ 28  
Program (PRGM) Menu .............................................................................. 34  
Chapter 2 Manual Calculations ...................................................................... 35  
2-1  
2-2  
2-3  
Basic Calculations ....................................................................................... 36  
Special Functions ........................................................................................ 39  
Function Calculations .................................................................................. 43  
Chapter 3 Numerical Calculations ................................................................. 53  
3-1  
3-2  
3-3  
3-4  
3-5  
3-6  
Before Performing a Calculation ................................................................. 54  
Differential Calculations ............................................................................... 55  
Quadratic Differential Calculations .............................................................. 58  
Integration Calculations ............................................................................... 60  
Maximum/Minimum Value Calculations ....................................................... 63  
Summation (Σ) Calculations ........................................................................ 65  
Chapter 4 Complex Numbers ......................................................................... 67  
4-1  
Before Beginning a Complex Number Calculation ...................................... 68  
4-2  
Performing Complex Number Calculations ................................................. 69  
Chapter 5 Binary, Octal, Decimal, and Hexadecimal Calculations ............. 73  
5-1  
Before Beginning a Binary, Octal, Decimal, or Hexadecimal  
Calculation with Integers........................................................................ 74  
Selecting a Number System ........................................................................ 76  
Arithmetic Operations .................................................................................. 77  
Negative Values and Bitwise Operations .................................................... 78  
5-2  
5-3  
5-4  
Chapter 6 Matrix Calculations ........................................................................ 79  
6-1  
6-2  
6-3  
6-4  
Before Performing Matrix Calculations ........................................................ 80  
Matrix Cell Operations ................................................................................. 83  
Modifying Matrices Using Matrix Commands .............................................. 88  
Matrix Calculations ...................................................................................... 92  
xxii  
 
Contents  
Chapter 7 Equation Calculations ................................................................... 99  
7-1  
7-2  
7-3  
7-4  
7-5  
Before Beginning an Equation Calculation ................................................ 100  
Linear Equations with Two to Six Unknowns............................................. 101  
Quadratic and Cubic Equations................................................................. 104  
Solve Calculations ..................................................................................... 107  
What to Do When an Error Occurs............................................................ 110  
Chapter 8 Graphing ....................................................................................... 111  
8-1  
8-2  
8-3  
8-4  
8-5  
8-6  
8-7  
8-8  
Before Trying to Draw a Graph.................................................................. 112  
View Window (V-Window) Settings ........................................................... 113  
Graph Function Operations ....................................................................... 117  
Graph Memory .......................................................................................... 122  
Drawing Graphs Manually ......................................................................... 123  
Other Graphing Functions ......................................................................... 128  
Picture Memory ......................................................................................... 139  
Graph Background .................................................................................... 140  
Chapter 9 Graph Solve.................................................................................. 143  
9-1  
Before Using Graph Solve......................................................................... 144  
9-2  
Analyzing a Function Graph ...................................................................... 145  
Chapter 10 Sketch Function ...........................................................................153  
10-1 Before Using the Sketch Function ............................................................. 154  
10-2 Graphing with the Sketch Function ........................................................... 155  
Chapter 11 Dual Graph ................................................................................... 167  
11-1 Before Using Dual Graph .......................................................................... 168  
11-2 Specifying the Left and Right View Window Parameters .......................... 169  
11-3 Drawing a Graph in the Active Screen ...................................................... 170  
11-4 Displaying a Graph in the Inactive Screen ................................................ 171  
Chapter 12 Graph-to-Table ............................................................................. 175  
12-1 Before Using Graph-to-Table..................................................................... 176  
12-2 Using Graph-to-Table ................................................................................ 177  
Chapter 13 Dynamic Graph ............................................................................ 181  
13-1 Before Using Dynamic Graph.................................................................... 182  
13-2 Storing, Editing, and Selecting Dynamic Graph Functions........................ 183  
13-3 Drawing a Dynamic Graph ........................................................................ 184  
13-4 Using Dynamic Graph Memory ................................................................. 190  
13-5 Dynamic Graph Application Examples ...................................................... 191  
Chapter 14 Conic Section Graphs ................................................................. 193  
14-1 Before Graphing a Conic Section .............................................................. 194  
14-2 Graphing a Conic Section ......................................................................... 195  
14-3 Conic Section Graph Analysis ................................................................... 199  
xxiii  
 
Contents  
Chapter 15 Table & Graph .............................................................................. 205  
15-1 Before Using Table & Graph...................................................................... 206  
15-2 Storing a Function and Generating a Numeric Table ................................ 207  
15-3 Editing and Deleting Functions.................................................................. 210  
15-4 Editing Tables and Drawing Graphs .......................................................... 211  
15-5 Copying a Table Column to a List.............................................................. 216  
Chapter 16 Recursion Table and Graph ........................................................ 217  
16-1 Before Using the Recursion Table and Graph Function ............................ 218  
16-2 Inputting a Recursion Formula and Generating a Table ............................ 219  
16-3 Editing Tables and Drawing Graphs .......................................................... 223  
Chapter 17 List Function ................................................................................229  
List Data Linking ................................................................................................... 230  
17-1 List Operations .......................................................................................... 231  
17-2 Editing and Rearranging Lists ................................................................... 233  
17-3 Manipulating List Data ............................................................................... 237  
17-4 Arithmetic Calculations Using Lists ........................................................... 244  
17-5 Switching Between List Files ..................................................................... 248  
Chapter 18 Statistical Graphs and Calculations .......................................... 249  
18-1 Before Performing Statistical Calculations ................................................ 250  
18-2 Paired-Variable Statistical Calculation Examples ...................................... 251  
18-3 Calculating and Graphing Single-Variable Statistical Data........................ 257  
18-4 Calculating and Graphing Paired-Variable Statistical Data ....................... 261  
18-5 Performing Statistical Calculations ............................................................ 270  
18-6 Tests .......................................................................................................... 276  
18-7 Confidence Interval ................................................................................... 294  
18-8 Distribution ................................................................................................ 304  
Chapter 19 Financial Calculations ................................................................. 321  
19-1 Before Performing Financial Calculations ................................................. 322  
19-2 Simple Interest Calculations ...................................................................... 324  
19-3 Compound Interest Calculations ............................................................... 326  
19-4 Investment Appraisal ................................................................................. 337  
19-5 Amortization of a Loan .............................................................................. 341  
19-6 Conversion between Percentage Interest Rate and Effective  
Interest Rate ........................................................................................ 345  
19-7 Cost, Selling Price, Margin Calculations ................................................... 347  
19-8 Day/Date Calculations ............................................................................... 349  
Chapter 20 Programming ............................................................................... 351  
20-1 Before Programming ................................................................................. 352  
20-2 Programming Examples ............................................................................ 353  
xxiv  
 
Contents  
20-3 Debugging a Program ............................................................................... 358  
20-4 Calculating the Number of Bytes Used by a Program ............................... 359  
20-5 Secret Function ......................................................................................... 360  
20-6 Searching for a File ................................................................................... 362  
20-7 Searching for Data Inside a Program ........................................................ 364  
20-8 Editing File Names and Program Contents ............................................... 365  
20-9 Deleting a Program ................................................................................... 368  
20-10 Useful Program Commands ...................................................................... 369  
20-11 Command Reference ................................................................................ 371  
20-12 Text Display ............................................................................................... 388  
20-13 Using Calculator Functions in Programs ................................................... 389  
Chapter 21 Data Communications ................................................................. 399  
21-1 Connecting Two Units ............................................................................... 400  
21-2 Connecting the Unit with a Personal Computer ........................................ 401  
21-3 Connecting the Unit with a CASIO Label Printer ....................................... 402  
21-4 Before Performing a Data Communication Operation ............................... 403  
21-5 Performing a Data Transfer Operation ...................................................... 404  
21-6 Screen Send Function ............................................................................... 408  
21-7 Data Communications Precautions ........................................................... 409  
Chapter 22 Program Library ........................................................................... 411  
1. Prime Factor Analysis ...................................................................................... 412  
2. Greatest Common Measure ............................................................................. 414  
3. t-Test Value ...................................................................................................... 416  
4. Circle and Tangents ......................................................................................... 418  
5. Rotating a Figure.............................................................................................. 425  
Appendix ...........................................................................................................429  
Appendix A Resetting the Calculator................................................................. 430  
Appendix B Power Supply ................................................................................. 432  
Appendix C Error Message Table ...................................................................... 436  
Appendix D Input Ranges.................................................................................. 438  
Appendix E Specifications ................................................................................. 441  
Index ..................................................................................................................... 443  
Command Index ................................................................................................... 449  
Key Index .............................................................................................................. 450  
Program Mode Command List .............................................................................. 453  
xxv  
 
 

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