Changing The Current Equation Type Setting; Eqn Mode Calculation Examples - Casio fx-991ZA PLUS II User Manual

Quadratic equation
Cubic equation
3. Use the Coefficient Editor that appears to input coefficient values.
2
• To solve 2x + x - 3 = 0, for example, press
input the following for the coefficients (a = 2, b = 1, c = -3): 2
3 .
• To change a coefficient value you already have input, move the cursor
to the appropriate cell, input the new value, and then press
• Pressing will clear all of the coefficients to zero.
Important!
• The following operations are not supported by the Coefficient Editor:
(M-),
input with the Coefficient Editor.
4. After all the values are the way you want, press
• This will display a solution. Each press of
solution. Pressing
the Coefficient Editor.
• You can scroll between the solutions using the
• To return to the Coefficient Editor while any solution is displayed,
press .
Note
• Even if Natural Display is selected, the solutions of simultaneous linear equations are
not displayed using any form that includes √ .
• Values cannot be converted to engineering notation on the solution screen.
• A message appears to let you know when there is no solution or when there are
infinite solutions. Pressing

Changing the Current Equation Type Setting

Press (EQN) and then select an equation type from the menu that
appears. Changing the equation type causes the values of all Coefficient
Editor coefficients to change to zero.

EQN Mode Calculation Examples

Example 1: x + 2y = 3, 2x + 3y = 4
2
(aX + bX + c = 0)
3
(aX + bX
(STO). Pol, Rec, ÷R, and multi-statements also cannot be
while the final solution is displayed will return to
or will return to the Coefficient Editor.
63
2
+ cX + d = 0)
in step 2, and then
,
.
will display another
and keys.
1
.