Texas Instruments TI-82 Manual page 17

TI-83 Even though it is very easy to see that f(0) = - 2,
you can have the calculator find the y-intercept while
viewing the graph by pressing
( ) . Type 0 at the X= prompt, press
1 value
and view the y-intercept f(0) = - 2.
TI-82 To graphically find an x-intercept, i.e., a value
of x at which the graph crosses the horizontal axis,
press
2nd TRACE
you are close to, but still to the left of the leftmost x-
intercept.
Press
ENTER
for the x-intercept.
Press until you are to the right of this x-intercept.
Press
ENTER
for the x-intercept.
Press to move the cursor nearer to where the graph
crosses the horizontal axis for the ÒguessÓ and press
.
ENTER
The value of the leftmost x-intercept is displayed as
X = 0.58578644.
Repeat the above procedure to find the other x-intercept.
Confirm that it is X = 3.4142136.
TI-83 To graphically find an x-intercept, i.e., a value
of x at which the graph crosses the horizontal axis,
press
2nd TRACE
Press until you are close to, but still to the left of
the leftmost x-intercept. Press
location of the left bound for the x-intercept.
Press until you are to the right of this x-intercept.
Press to mark the location of the right bound
ENTER
for the x-intercept.
For your ÒguessÓ, press
where the graph crosses the horizontal axis and press
Copyright © Houghton Mifflin Company. All rights reserved.
2nd TRACE
( ) ( ) . Press
CALC 2 root
to mark the location of the lower bound
to mark the location of the upper bound
( ) (z ) .
CALC 2 ero
ENTER
to move the cursor nearer to
( )
CALC
,
ENTER
until
to mark the
.
ENTER
A-17
Chapter 1
The TI-82 uses ÒlowerÓ
to mean Òto the left ofÓ
the intercept.
The TI-82 uses ÒupperÓ
to mean Òto the right ofÓ
the intercept.