Texas Instruments TI-92 Getting Started page 3

Technology Tip: The TI-92 has two different inputing modes: insert and overtype. The default mode is the insert
mode, in which the cursor is a blinking vertical line and new text will be inserted at the cursor's position and other
characters are pushed to the right. In the overtype mode, the cursor is a blinking square and the characters that you
type replace the existing characters. To change from one mode to another, press 2nd INS. The TI-92 remains in
whatever the last input mode was, even after being turned off.
Even if you had pressed ENTER, you may still edit the previous expression. Immediately after you press ENTER
your entry remains on the entry line. Pressing the
of the line, while pressing the
expression can be edited as above. To edit a previous expression that is no longer on the entry line, press 2nd and
then ENTRY to recall the prior expression. Now you can change it. In fact, the TI-92 retains as many entries as the
current history area holds in a "last entry" storage area, including entries that have scrolled off of the screen. Press
2nd ENTRY repeatedly until the previous line you want is on the entry line. (The number of entries that the history
area can hold may be changed, see your user's manual for more information.)
To clear the entry line, press CLEAR while the cursor is on that line. To clear previous entry/answer pairs from the
history area, use the cursor pad to either the entry or the answer and press CLEAR (both the entry and the answer
will be deleted from the display). To clear the entire history area, press F1[Tools] 8 [Clear Home], although this
will not clear the entry line.
Technology Tip: When you need to evaluate a formula for different values of a variable, use the editing feature to
simplify the process. For example, suppose you want to find the balance in an investment account if there is now
$5000 in the account and interest is compounded annually at the rate of 8.5%. The formula for the balance is
( )
nt
P +
1 r , where P = principal, r = rate of interest (expressed as a decimal), n = number of times interest is
n
compounded each year, and t = number of years. In our example, this becomes 5000(1 + .085)
keystrokes for finding the balance after t = 3, 5, and 10 years.
Years
3
5
10
3
Graphing Technology Guide: TI-92
Figure 5.5: Editing a calculation
direction on the cursor pad moves the cursor to the beginning
direction on the cursor pad puts the cursor at the end of the line. Now the
Keystrokes
5000 ( 1 + .085 ) ∧ 3 ENTER
5 ENTER
10 ENTER
Figure 5.6: Editing expressions
Copyright © Houghton Mifflin Company. All rights reserved.
t
. Here are the
Balance
$6,386.45
$7,518.28
$11,304.92