Texas Instruments PLUS TI-89 - Manual (Page 66)

Chapter 2: Operating the Calculator 49
02OPER DOC TI-89/TI-92 Plus: Operating the TI-89/TI-92 Plus (English) Susan Gullord Revised: 02/23/01 1:06 PM Printed: 02/23/01 2:11 PM Page 49 of 44
When you press ¸ to evaluate an expression, the TI -89 / TI-92 Plus
leaves that expression on the entry line and highlights it. You can
type over the entry, or you can reuse it as necessary.
For example, using a variable, find the square of 1 , 2 , 3 , etc.
As shown below, set the initial variable value and then enter the
variable expression. Next, reenter to increment the variable and
calculate the square.
On the TI . 89: On the TI . 92 Plus: Display
0 §
2 ™ N U M
¸ 0 §
N U M
¸
N U M j « 1 §
2 ™ N U M
2 Ë N U M Z 2
¸ N U M « 1 §
N U M
2 Ë N U M Z 2
¸
¸ ¸ ¸ ¸
Reusing a Previous Entry or the Last Answer
You can reuse a previous entry by reexecuting the entry “as is”
or by editing the entry and then reexecuting it. You can also
reuse the last calculated answer by inserting it into a new
expression.
Reusing the
Expression on the
Entry Line
Tip: Reexecuting an entry
“as is” is useful for iterative
calculations that involve
variables.