Texas Instruments TI-83 Using

Using a TI-83/TI-84 Graphing Utility:
I. Find and store the roots/zeros of
2
( ) 12 3
f x x x
= − +
.
Graph Y
1
=
2
12 3
x x
− +
.
Zoom 6 for the standard window… [-10, 10]
1
x [-10, 10]
1
.
Zoom Out (Zoom 3 ENTER) to view the other root.
Find the left root:
Press 2
nd
TRACE 2: zero.
Left Bound? Press ENTER on
0 3
x y
= =
.
Right Bound? Move cursor to the right to get a negative y-coordinate.
Press ENTER on
.85106383 6.488456
x y
= = −
.
Guess? Press ENTER.
Store left root as A:
Press 2
nd
MODE (to QUIT GRAPH screen and view HOME screen).
Press X,T, θ ,n STO  ALPHA A ENTER.
Find the right root:
Press 2
nd
TRACE 2: zero.
Left Bound? Move cursor to the right to get a negative y-coordinate.
Press ENTER on
11.06383 7.357628
x y
= = −
.
Right Bound? Move cursor to the right to get a positive y-coordinate.
Press ENTER on
11.914894 1.9859665
x y
= =
.
Guess? Press ENTER.
Store right root as B:
Press 2
nd
MODE (to QUIT GRAPH screen and view HOME screen).
Press X,T, θ ,n STO  ALPHA B ENTER.
2
( ) 12 3
f x x x
= − +
has roots/zeros at approximately
(0.225,0)
and
(11.745,0)
.

Texas Instruments TI-83 Specifications

General

Programming	TI-BASIC
Processor	Zilog Z80, 6 MHz
Weight	7.4 oz (210 g)
Display	96x64 pixels, monochrome LCD
Power Source	4 AAA batteries, 1 CR1616 or CR1620 for backup
Memory	32 KB RAM
Connectivity	2.5mm I/O port for linking with other TI calculators