Texas Instruments -84 Plus, Manual Book

Page: 463 / 696

Chapter 17: Activities 460
Chapter 17:
Chapter 17: Chapter 17:
Chapter 17:
Activities
Activities Activities
Activities
The Quadratic Formula The Quadratic Formula The Quadratic Formula The Quadratic Formula
Entering a Calculation Entering a Calculation Entering a Calculation 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
Œ
) 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.
4. Press
Í
to store the values to the
variables A, B, and C.
The last value you stored is shown on
the right side of the display. The cursor
moves to the next line, ready for your
next entry.