Displaying Complex Results: The Quadratic Formula - Texas Instruments TI-82 STATS Manual Book

Displaying Complex Results: The Quadratic Formula

Now solve the equation 2X
the TI-82 STATS displays complex results.
1. Press z † † † † † † (6 times), and
then press ~ to position the cursor over
Press Í to select
mode.
2. Press y [
QUIT
home screen, and then press ' to clear it.
¿ ƒ [
3. Press
2
¿ ƒ [
B
] Í.
[
C
The coefficient of the X
of the X term, and the constant for the new
equation are stored to A, B, and C,
respectively.
4. Press y [
ENTRY
instruction, and then press y [
to recall the quadratic-formula expression,
2 4
b b ac
2 a
5. Press Í to find one solution for the
2
equation 2X N X + 3 = 0.
6. Press y [
ENTRY
quadratic-formula expression is displayed:
2 4
b b ac
2 a
7. Press Í to find the other solution for the
quadratic equation: 2X
Note: An alternative for solving equations for real numbers is to use the built-in Equation
Solver (Chapter 2).
8 Getting Started
2
N X + 3 = 0. When you set
i complex-number
a+b
] (above z) to return to the
] ƒ [
A :
] ƒ [ ¿ ƒ
]
3
:
2
term, the coefficient
] to recall the store
ENTRY
] repeatedly until this
2
N X + 3 = 0.
a+b
i.
a+b
] Ì
1
] again
i complex number mode,