Casio CFX-9970G User Manual page 130

• 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 x
3 – 4
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 x
3 + 2
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
5x
2 + – 2 = 0
x
+ – 3 = 0
7 - 3
105