Casio fx-9750G PLUS User Manual
Page 133
105
• Internal calculations are performed using a 15-digit mantissa, but results are
displayed using a 10-digit mantissa and 2-digit exponent.
• An error occurs whenever the unit is unable to solve the equations.
• Pressing 1 (REPT) returns to the initial display of the Cubic Equation Mode.
k
k
k
k
k
Multiple root (1 or 2) solutions or imaginary number
solutions
The following examples illustrate how multiple-root solutions and imaginary
number solutions are handled.
u
u
u
u
u
To solve a cubic equation that produces a multiple-value solution
Example
To solve the following cubic equation:
x
3
– 4
x
2
+
5x
– 2 = 0
bw-ewfw-cw
1
(SOLV)
u
u
u
u
u
To solve a cubic equation that produces an imaginary number
solution
Example
To solve the following cubic equation:
x
3
+
x
2
+
x
– 3 = 0
bwbwbw-dw
1
(SOLV)
It may take considerable time for the calculation result of cubic equations to
appear on the display. Failure of a result to appear immediately does not
mean that the unit is not functioning properly.
Quadratic and Cubic Equations
7 - 3