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