Casio FX-991ES Support Question
Casio FX-991ES Support Question
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Question posted by vancezek on August 8th, 2014
How To Solve Equations 3 Unknown In Casio Fx-991es
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Related Casio FX-991ES Manual Pages
User Guide - Page 4
... actual items they represent.
• The contents of this product and items that come with it . Initializing the Calculator
Perform the following shows an example of how a key operation to the separate Appendix. Moreover, CASIO Computer Co., Ltd.
Note that this User's Guide, cursor key operation is indicated as key markings) shown...
User Guide - Page 5
..., creating the risk of small children. Battery
• After removing the battery from the calculator, put it in a safe place where it will not get into the
calculator. • Use only the type of battery specified for this calculator in
this manual handy for later reference. Never expose the battery to direct heat...
User Guide - Page 8
...this:
The keypad has been shifted by pressing the S key. There is in independent memory. Calculation history memory data is available and can be exited and this indicator will disappear when you press... t. E-6 Math style is more data above/below the current screen. The calculator is standing by for input of decimal places is degrees.
The default angle unit is ...
User Guide - Page 9
... takes a long time to control how the calculations are executed and displayed. c
f
E-7 Select this type of operation: General calculations Complex number calculations Statistical and regression calculations Calculations involving specific number systems (binary, octal, decimal, hexadecimal) Equation solution Matrix calculations Generation of calculation that corresponds to the mode you want...
User Guide - Page 12
...automatically input with the open parenthesis ( ( ) character. Example: 2 (5 + 4) - 2 × (-3) =
LINE
2(5+4)2*y3=
Inputting a Function with Parenthesis
When you input calculation expressions just as shown below.
19(CLR)1(Setup)=(Yes)
This setting: Calculation Mode Input/Output Format Angle Unit Display Digits Fraction Display Format Complex Number Format Statistical Display Decimal Point...
User Guide - Page 13
... to shift to the left and view the hidden part by pressing the d key. This will cause the ' indicator to appear to the right of a calculation, immediately before the = key is pressed. At this time, the ] indicator appears to the left side of the following cases. • Before an open parentheses...
User Guide - Page 31
... for X.) Y = X × log(2,Y (When the variable specification ",Y" is included,
the equation Y = X × log102 is solved for Y.) Y = X × log(2,Y) (When the variable specification ",X" is omitted,
the equation Y = X × log2Y is solved for X. Appendix
Calculate an +1 = an + 2n (a1 = 1) as XY + C = 0.)
• SOLVE cannot be used to a2. *6 Value of a3 *8 Value of a5
Using...
User Guide - Page 32
... be able to determine the correct solution, even when one exists. E-30
If this happens, try changing the initial value of the solution variable. • SOLVE may not be able to obtain a solution because of the initial
value (assumed value) of the solution variable.
MATH
Math
Sf(Y)Ss(=)Sy(A) S)(X)w+Se(B) 1)(,)S)(X)
Math...
User Guide - Page 33
...types of functions. - A function whose graph includes a steep slope (y = e x, y =1/x, etc.) -
A periodic function (y = sin(x), etc.) - Continue Screen SOLVE performs convergence a preset number of times. A discontinuous function (y = 'x, etc.)
Solution Screen Contents
Input equation
Solution variable
Math
Solution
(left side) - (right side) form result
• The "(left side) - (right side...
User Guide - Page 42
... in this section to transform a displayed value to engineering notation, or to one of the following equation are
equal:
Σ e
∞
=
n = 0
1 n!
Performing S-D transformation again ... engineering notation. Transforming Displayed Values
You can be used to transform a displayed decimal calculation result to transform between its decimal (D) form and its standard (S) form (fraction,...
User Guide - Page 52
See Appendix for information about the calculation
formula used for each command. Sum Sub-menu (11(STAT)4(Sum))
Select this menu item: 1Σx2...that appear on the STAT menu while linear regression is performed in accordance with the following model equation. Commands when Linear Regression Calculation (A+BX) Is Selected With linear regression, regression is selected as the statistical...
User Guide - Page 53
... r Estimated value of x Estimated value of y
Appendix Linear Regression Calculation: to obtain this menu item: 1A 2B
3C
4m1 5m2 6n
When...want to
• Examples through all use the data input in accordance with the following model equation. Appendix Quadratic Regression Calculation: to • Examples through all use the data input in Example .
*1 Estimated Value (y...
User Guide - Page 54
... Reg sub-menu can take a long
time to ). Statistical Calculation Type
Logarithmic Regression (ln X)
e Exponential Regression (e^X)
ab Exponential Regression (A•B^X)
Model Equation
y = A + Bln X y = AeBX y = ABX
Power Regression (A•X^B) y = AXB
Inverse Regression (1/X)
y
=
A
+
B X
Calculation Formula
Appendix Comparison of Regression Curves • The following example...
User Guide - Page 57
...
3 aX2 + bX + c = 0 4 aX3 + bX2 + cX + d = 0
Equation Type
Simultaneous Linear Equations with Two Unknowns
Simultaneous Linear Equations with Three Unknowns
Quadratic Equation
Cubic Equation
Changing the Current Equation Type Setting Press N5(EQN) to press Ab first. Press this key: When you press N5(EQN) and enter the EQN Mode. Equation Calculations (EQN)
All calculations in the EQN Mode (N5...
User Guide - Page 58
... visible on the display when the coefficient editor screen is first displayed.
Pressing
= while the final solution is one. Simultaneous linear equations with two unknowns
Cubic equation
Rules for each of an equation.
The coefficient editor screen shows input cells for Inputting and Editing Coefficients • Data you input is located.
k Solution Display
After...
User Guide - Page 59
... whenever you enter the MATRIX Mode.
(2) Press a number key (1, 2, or 3) to specify the name of simultaneous linear equations, you can use the f and c keys to engineering notation while an equation solution is displayed. Matrix calculation results are performed in the MATRIX Mode (N6). • In the case of the matrix you want to...
User Guide - Page 72
E-70 Can't Solve Error (SOLVE feature only) • Cause
• The calculator could not obtain a solution. • Action
• Check for errors in the equation you input as the solution variable.
Insufficient MEM Error • Cause
• There is not enough memory to perform your calculation. • Action
• Narrow the table calculation range by changing the...
User Guide - Page 75
CASIO COMPUTER CO., LTD.
6-2, Hon-machi 1-chome Shibuya-ku, Tokyo 151-8543, Japan
SA0411-B Printed in China
Appendix - Page 7
sG=3=
*7
sG=4=
*8 #017 MATH
Math
Sf(Y)Ss(=)S)(X) w-S)(X)+1
Math
1s(SOLVE)
Math
*1
3=
Math
*2
1=
Math
=7==
Math
=13==
-6-
Appendix - Page 52
CASIO COMPUTER CO., LTD.
6-2, Hon-machi 1-chome Shibuya-ku, Tokyo 151-8543, Japan
SA0411-B
Printed in China Imprimé en Chine
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