Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book page 304

Entering a Calculation
Begin with the equation 2x
¿ ƒ
1. Press
2
coefficient of the x
2. Press ƒ [:]. The colon allows you to
enter more than one instruction on a line.
3. Press Ì ¿ ƒ
11
coefficient of the X term. Press ƒ [:]
to enter a new instruction on the same
¿ ƒ
line. Press
14
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.
5. Press ƒ ^
1
ƒ ¡ ¹ ƒ
B 4
ƒ
to enter the expression for one
A
of the solutions for the quadratic formula,
2
±
– b b – 4ac
--------------------------------------
2a
6. Press Í to find one solution for the
2
equation 2x N 11x + 14 = 0.
The answer is shown on the right side of
the display. The cursor moves to the next
line, ready for you to enter the next
expression.
Converting to a Decimal
You can show the solution as a decimal.
1. Press ƒ ^
4
the shortcut menu.
FRAC
2
N 11x + 14 = 0.
to store the
A
2
term.
to store the
B
to store the
C
Ì ƒ Ã y C
B
ƒ ~ ~
A C 2
to select 4 from
F D
3 4
Chapter 17: Activities 297