Casio CFX-9850G PLUS, User'S Manual & Technical Reference

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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.
b
w-
c
w-
b
w
c
w
• 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