Texas Instruments TI-83 PLUS - Manual (Page 543)

TI-83 Plus Activities 540
Chapter 17:
Activities
The Quadratic Formula
Entering a Calculation
Use the quadratic formula to solve the quadratic equations 3X
2
+ 5X + 2 = 0 and
2X
2 N X + 3 = 0. Begin with the equation 3X
2
+ 5X + 2 = 0.
1. Press 3
¿ ƒ [
A
] (above  ) to store
the coefficient of the X 2 term.
2. Press ƒ [
:
] (above Ë ). The colon allows
you to enter more than one instruction on a line.
3. Press 5
¿ ƒ [
B
] (above Π) to store
the coefficient of the X term. Press ƒ [
:
] to
enter a new instruction on the same line. Press
2
¿ ƒ [
C
] (above  ) to store the
constant.