Operation Manual

3-22 Function Graphing
8203FUNC.DOC TI-82, Chapter 3, English Bob Fedorisko Revised: 02/09/01 9:06 AM Printed: 02/09/01
12:36 PM Page 22 of 24
root
root
(
CALC
item
2
) uses
solve(
(Chapter 2) to find the root (zero or
X
-intercept) of a function. Selecting good values for the bounds and a guess
help it find the correct root and find it more quickly.
1. Select
root
from the
CALC
menu. The current graph is displayed, with a
prompt to enter
Lower Bound
.
2. Use
†
or
}
to move the cursor to the function for which you want to
find the root.
3. Move the cursor to the
X
value you want for the lower bound of the
interval and press
Í
. A
4
indicator at the top of the display shows
the lower bound.
4. Set the upper bound in the same way. An indicator shows the upper
bound.
5. You are prompted for a
Guess
to help the TI
.
82 find the correct root
and to find it more quickly.
6. Use
|
or
~
to move the cursor to a point near the root of the function,
between the bounds. Press
Í
.
The result cursor is on the solution and the coordinate values are displayed
(even if you have selected
CoordOff
on the
WINDOW FORMAT
screen).
When you press
|
,
~
,
}
, or
†
, the free-moving cursor appears.