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• 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.
kk
kk
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.
uu
uu
uTo solve a cubic equation that produces a multiple-value solution
Example To solve the following cubic equation:
x
3
– 4x
2
+ 5x – 2 = 0
bw-ewfw-cw
1(SOLV)
uu
uu
uTo 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