Texas Instruments TI-92 Getting Started page 4

Then, to find the balance from the same initial investment but after 5 years when the annual interest rate is 7.5%,
press the following keys to change the last calculation above:
use the CLEAR key to erase everything to the right of the current location of the cursor. Then, changing the
calculation from 10 years at the annual interest rate of 8.5% to 5 years at the annual interest rate of 7.5% is then
done by pressing
5.1.3 Key Functions: Most keys on the TI-92 offer access to more than one function, just as the keys on a computer
keyboard can produce more than one letter ("g" and "G") or even quite different characters ("5" and "%"). The
primary function of a key is indicated on the key itself, and you access that function by a simple press on the key.
To access the second function indicated in yellow or to the left above a key, first press 2nd ("2nd" appears on the
status line) and then press the key. For example to calculate
Technology Tip: The TI-92 automatically places a left parenthesis, (, after many functions and operators (including
x
LN, 2nd e , SIN, COS, TAN, and 2nd
error message indicating that the right parenthesis is missing.
When you want to use a function printed in green or to the right above a key, first press
status line) and then press the key. For example, if you are in EXACT calculation mode and want to find the
45 press 2nd
approximate value of
typewriter and can produce both upper and lower case letters. To switch from one case to another, press 2nd CAPS.
For a single upper case letter, use the
the 2nd and
keys. Some of the most commonly used symbols are marked on the keyboard, but most are not. See
your TI-92 user's manual for more information.
5.1.4 Order of Operations: The TI-92 performs calculations according to the standard algebraic rules. Working
outwards from inner parentheses, calculations are performed from left to right. Powers and roots are evaluated first,
followed by multiplications and divisions, and then additions and subtractions.
Enter these expressions to practice using your TI-92.
Expression
7 – 5·3
(7 – 5)·3
2
120 – 10
2
(120 – 10)
24
3
2
3
 24 
 
 2 
(7 – –5) · –3
5.1.5 Algebraic Expressions and Memory: Your calculator can evaluate expressions such as
have entered a value for N. Suppose you want N = 200. Press 200 STO➧ N ENTER to store the value 200 in
memory location N. Whenever you use N in an expression, the calculator will substitute the value 200 until you
make a change by storing another number in N. Next enter the expression
4
Graphing Technology Guide: TI-92
CLEAR 5
). If a right parenthesis is not entered, the TI-92 will respond with an
45 ) ≈. The QWERTY keyboard on the TI-92 is similar to a
key. There are also additional symbols available from the keyboard by using
Keystrokes
7 – 5 × 3 ENTER
( 7 – 5 ) × 3 ENTER
120 – 10 ∧ 2 ENTER
( 120 – 10 ) ∧ 2 ENTER
24 ÷ 2 ∧ 3 ENTER
( 24 ÷ 2 ) ∧ 3 ENTER
( 7 – (-) 5 × (-) 3 ENTER
Copyright © Houghton Mifflin Company. All rights reserved.
5
7 ENTER.
25 , press 2nd
N N +
(
2
7 ENTER. You could also
25 ) ENTER.
(" "appears on the
Display
–8
6
20
12100
3
1728
–36
N N +
( 1)
after you
2
1)
by typing N x ( N + 1) ÷ 2