Casio fx-991EX Classwiz Tips: Solve for Any Variable
This week I am going to show some things that can be done with the Casio fx-991EX Classwiz.
Solving For Any Variable
The Casio Classwiz can solve equations in the main (Calculate) mode in the following formats:
Equation, i.e. A + 2x = y^3
And Expression Equal to Zero, i.e. 2x^4 - 18 (the equal to zero is implied)
Pressing [SHIFT] [CALC] (SOLVE) allows us to enter values for all but one variable to solve for. Enter values with the equals [ = ] key.
When you select the variable to solve for, press the [ = ] key without entering a number.
Caution: When you are entering equations, don't use the white [ = ] key. To enter the = character, press [ALPHA] [ CALC ].
The L-R indicator tells the the accuracy of the solution. We want L-R = 0.
Example:
2x^2 + 3y^3 = A
Keystrokes: 2 [ x ] [ x^2 ] [ + ] 3 [ALPHA] (Y) [SHIFT] (x^3) [ALPHA] (=) [ALPHA] (A)
[SHIFT] (SOLVE)
Inputs: x = 8, y = 2, solve for A. A = 152, L-R = 0
Inputs: x = 6, A = 79, solve for y. y = 1.326352406, L-R = 0
Inputs: y = 3.5, A = 105, solve for x. Cannot Solve (x has a complex number solution)
Eddie
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