Casio fx-570MS - Manual (Page 19)

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Solving Quadratic Equations and Cubic Equations
Example 2 Example 2
Operation
Solve the equation x 3 + 2 x 2 – 2 x + 3 = 0 in
the range of complex numbers.
*The following shows operation using the fx-100MS/115MS/570MS/
991MS.
1 .
Select the EQN Mode and then specify the degree of the equation.
In this example we want to solve a cubic equation,
so you would specify 3.
F F F 1
r
(Degree?) 3
2 .
Input values for a , b , c , and d in the cubic equation ax 3 + bx 2 + cx + d = 0.
(a?) 1 =
(b?) 2 =
(c?) D 2 =
(d?) 3 =
3 .
One of the solutions obtained appears on the display.
4 .
Display the next solution.
]
This causes the symbol R
↔I to appear in the upper right corner
of the display.
This indicates that the displayed solution is a complex number,
and the real part is 0.5.
3
y
x
– 3
2
1
– 2 – 1