Texas Instruments TI-89 Manual page 3

TI-89 Guide
3
Now, evaluate e * 0.027 and e
parenthesis when you press
right parenthesis or insert an extra parenthesis, the TI-89 gives an
error message. Press
If you want to edit a previous expression to a new expression, have
the cursor on the entry line and press
the right-hand side of the entry line expression. If you press
cursor appears on the left-hand side of the entry line expression. Try
3
editing e * 0.027 to type e
•
To recall an expression prior to the current one (before the history area is cleared), press
ENTER (ENTRY).
paste" a duplicate of it on the entry line. This allows you to insert something previously typed or
calculated into a new expression. First, place the cursor in the entry line where you want to
insert the entry or answer. Second, move the cursor, repeatedly using
inserting is highlighted. Third, press
2. USI NG THE ANS MEMORY Next we explore recalling previous expressions and answers to
use in new calculations. We also see how to use the TI-89 answer memory. Instead of again typ-
ing an expression that was just evaluated, use the answer memory by pressing
1
F
Find
895
+
G
4 15 *
G
7
H
Enter with
Ans 2nd
NOTE: The last-calculated answer is referred to by the TI-89 on the entry line as
enter each expression. The expression for the answer is substituted when the new expression
appears in the history area. You can also use auto-paste to enter the previous results.
3. ANSWER DI SPLAY We have
whenever possible. If you have a decimal in an expression, a decimal value is returned for the
answer. If you want a decimal approximation for the expression that appears on the entry line,
press
ENTER .
+
2 1
Type press
,
5 3
press
ENTER .
7
is highlighted. Press
1315
and insert a decimal point after
Use ◄
the 7. Press
ENTER .
Copyright © Houghton Mifflin Company. All rights reserved.
3*0.027
. The TI-89 prints the left
x
(e ).
X
fix the error, and press
ESC ,
►
3*0.027
.
You can also select any entry or answer from the history area and "auto-
ENTER
−
1
I
using this shortcut.
J
J
K
−
.
( ) ( A N S )
set to
MODE
We also illustrate how to retrieve a previous entry that is in the history area.
and then
ENTER ,
Press until
▲
ENTER .
If you do not include a
ENTER .
. The cursor appears on
◄ ,
.
which means that an exact answer is given
AUTO
TI 89-3
the
, until what you are
▲
−
2nd (ANS).
( )
when you
ans(1)
2nd