Texas Instruments PLUS TI-89 - Manual (Page 239)

222 Chapter 13: Tables
13TABLES.DOC TI-89/TI-92 Plus: Tables (English) Susan Gullord Revised: 02/23/01 1:08 PM Printed: 02/23/01 2:16 PM Page 222 of 10
Steps
³
TI-89
Keystrokes
›
TI-92 Plus
Keystrokes Display
1. Display the MODE dialog box.
For the Graph mode, select
FUNCTION .
3
B 1
¸ 3
B 1
¸
2. Display and clear the Y= Editor.
Then define y1(x) = x 3 – 2x .
¥ #
ƒ 8 ¸
¸
X Z 3 | 2 X
¸ ¥ #
ƒ 8 ¸
¸
X Z 3 | 2 X
¸
3. Set the table parameters to:
tblStart = ë 10
@ tbl = 1
Graph < - > Table = OFF
Independent = AUTO
¥ &
· 1 0
D 1
D B 1
D B 1 ¸ ¥ &
· 1 0
D 1
D B 1
D B 1 ¸
4. Display the Table screen. ¥ ' ¥ '
5. Scroll through the table. Notice
that y1 changes sign at x = ë 1 , 1 ,
and 2 .
To scroll one page at a time, use
2 D and 2 C .
D and C
as necessary D and C
as necessary
6. Zoom in on the sign change
between x = ë 2 and x = ë 1 by
changing the table parameters
to:
tblStart = ë 2
@ tbl = . 1
„
· 2
D.1
¸ ¸ „
· 2
D . 1
¸ ¸
Preview of Tables
Evaluate the function y=x 3 ì 2x at each integer between ë 10 and 10. How many sign
changes are there, and where do they occur?