Casio CFX-9970G Manual - Página 7

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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.

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:

– 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:

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

– 2 = 0

– 3 = 0

7 - 3

105