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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
GG
GG
G 0):
• Quadratic: ax
2
+ bx + c = 0
• Cubic:
ax
3
+ bx
2
+ cx + d = 0
kk
kk
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
kk
kk
k Solving a Quadratic or Cubic Equation
Example To solve the following cubic equation:
x
3
– 2x
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