3 quadratic and cubic equations, Kspecifying the degree of an equation, Ksolving a quadratic or cubic equation – Casio fx-9750G PLUS User Manual

Page 132

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104

7-3 Quadratic and Cubic Equations

This calculator can also solve quadratic and cubic equations that match the
following formats (when

a

G

G

G

G

G

0):

• Quadratic:

ax

2

+

bx

+

c

= 0

• Cubic:

ax

3

+

bx

2

+

cx

+

d

= 0

k

k

k

k

k

Specifying the Degree of an Equation

While in the Equation Mode, press 2 (POLY) and then specify the degree of the
equation.

• {

2}/{3} ... {quadratic}/{cubic} equation

k

k

k

k

k

Solving a Quadratic or Cubic Equation

Example

To solve the following cubic equation:

x

3

– 2

x

2

x

+ 2 = 0

1. Press 2 (3) to enter the Cubic Equation Mode.

2. Input each coefficient.

bw-cw-bwcw

• Each time you press w, the input value is registered in the highlighted cell.

Each press of w inputs values in the following sequence:
coefficient

a

coefficient

b

coefficient

c

coefficient

d

Input for coefficient

d

is required only for cubic equations.

• You can input fractions and value memory contents as coefficients.

3. After inputting the coefficients, press 1 (SOLV) to solve the equations.

Highlighted solution cell value

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