Casio SERIES FX-9860G - Manual (Page 170)

20070201
4-2-1
Quadratic and Cubic Equations
# Internal calculations are performed using a
15-digit mantissa, but results are displayed
using a 10-digit mantissa and a 2-digit
exponent.
# It may take considerable time for the
calculation result of cubic equations to
appear on the display.
# An error occurs if the calculator is unable to fi nd
a solution.
# After calculation is complete, you can press
1(REPT), change coeffi cient values, and then
re-calculate.
4-2 Quadratic and Cubic Equations
Description
You can use this calculator to solve quadratic equations and cubic equations.
• Quadratic Equation:
ax 2 + bx + c = 0 ( a
≠ 0)
• Cubic Equation:
ax 3 + bx 2 + cx + d = 0 ( a
≠ 0)
Set Up
1. From the Main Menu, enter the EQUA mode.
Execution
2. Select the POLY (higher degree equation) mode, and specify the degree of the
equation.
You can specify a degree 2 or 3.
3. Sequentially input the coeffi cients.
The cell that is currently selected for input is highlighted. Each time you input a
coeffi cient, the highlighting shifts in the sequence:
a → b → c → …
You can also input fractions and values assigned to variables as coeffi cients.
You can cancel the value you are inputting for the current coeffi cient by pressing J
at any time before you press w to store the coeffi cient value. This returns to the
coeffi cient to what it was before you input anything. You can then input another value if
you want.
To change the value of a coeffi cient that you already stored by pressing w, move the
cursor to the coeffi cient you want to edit. Next, input the value you want to change to.
Pressing 3(CLR) clears all coeffi cients to zero.
4. Solve the equations.