CASIO fx-991CW

[Eddie W. Shore]

Storing Numbers in Solver

The Solver can solve for any variable, not just x. Store values in other variables through the [VARIABLE] key.

Example: A^2+B^2=C^2

If A = 5 and C = 13, solve for B.

[ HOME ], Equation
Select Solver
Type A^2+B^2=C^2, press [ EXE ]
At the Solve Target screen, select B
Store 5 in A by pressing [VARIABLE], select A, [ OK ], Edit, entering 5, [OK]
(we're back to the variable screen)
Store 13 in C by selecting C, [ OK ], Edit, entering 13, [ OK ]
Press [ undo ] to get back to the Enter Initial Value Screen.
Select Execute to solve for B.

B = 12, L-R = 0




Storing Statistical Results

Again, storing is through the [VARIABLE] key.

Example: Store Σx in E and Σx^2 in F through the following data:

12.3
13.6
14.9
18.8

Enter data in 1-varaible statistics.
Press [ EXE ], select Statistics Calc.

Recall Σx by [CATALOG], Statistics, Summation, Σx, [ EXE ], [ EXE ] (twice)
[VARIABLE], select E, [ OK ], Store (59.6 is stored in E)

Recall Σx^2 by [CATALOG], Statistics, Summation, Σx^2, [ EXE ], [ EXE ] (twice)
[VARIABLE], select E, [ OK ], Store (911.7 is stored in F)

Values stored in variables are retained until cleared by a reset or a new value replaces the old value.


Other

I do miss the ALPHA key and the independent variable M/M+/M-. I would have been nice to store custom functions assigned to the shifted functions of [ × ] and [ ÷ ].