I.1.4 Order of Operations: The TI-82 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.
Note that the TI-82 distinguishes between subtraction and the negative sign. If you wish to enter a negative
number, it is necessary to use (-) key. For example, you would evaluate by pressing
(-) 5 – (4 (-) 3 ) ENTER to get 7.
Enter these expressions to practice using your TI-82.
Expression Keystrokes Display
7 – 5 3 ENTER -8
(7 – 5) 3 ENTER 6
120 – 10 ENTER 20
(120 – 10) ENTER 12100
24 ÷ 2 ^ 3 ENTER 3
(24 ÷ 2) ^ 3 ENTER 1728
(7 – (-) 5 ) (-) 3 ENTER -36
I.1.5 Algebraic Expressions and Memory: Your calculator can evaluate expressions such as after
you have entered a value for N. Suppose you want Press 200 STO ALPHA N ENTER to store
the value of 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
by typing ALPHA N ( ALPHA N + 1 ) ÷ 2 ENTER. For you will find that
The contents of any memory location may be revealed by typing just its letter name and then ENTER. And
the TI-82 retains memorized values even when it is turned off, so long as its batteries are good.
I.1.6 Repeated Operations with ANS: The result of your last calculation is always stored in memory
location ANS and replaces any previous result. This makes it easy to use the answer from one computation
in another computation. For example, press 30 + 15 ENTER so that 45 is the last result displayed. Then
press 2nd ANS ÷ 9 ENTER and get 5 because
With a function like division, you press the key after you enter an argument. For such functions, whenever
you would start a new calculation with the previous answer followed by pressing the function key, you may
press just the function key. So instead of 2nd ANS ÷ 9 in the previous example, you could have pressed
simply ÷9to achieve the same result. This technique also works for these functions: + – .x
-1
x
2
45 9 5.
N
N 1
2
20,100.N 200,
N
N 1
2
N 200.
N
N 1
2
7 5
3
24
2
3
24
2
3
x
2
120 10
2
x
2
120 10
2
7 5
3
7 5
3
5 (4
3)
Graphing
Technology Guide Copyright © by Houghton Mifflin Company. All rights reserved. I-3
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