Page 113 - Basic College Mathematics with Early Integers

90 C HAPTE R 1 I THE WHOLE NUMBERS

Calculator Explorations Exponents

To evaluate an exponent such as 4 7 on a calculator, find can key in a problem exactly as it is written and the cal-
the keys marked y x or ¿ and = or ENTER . culator will perform operations in the proper order.
When evaluating an expression containing parentheses,
7
To evaluate 4 , press the keys 4 y x (or ¿ ) 7 key in the parentheses. (If an expression contains brack-
= or ENTER . The display will read 16384 . ets, key in parentheses.) For example, to evaluate
7
Thus, 4 = 16,384. 2[25 - (8 + 4)] - 11, press the keys 2 * (
25 - ( 8 + 4 ) ) - 11 = or
Use a calculator to evaluate.
ENTER .
1. 4 6 2. 5 6 3. 5 5 The display will read 15 .
4. 7 6 5. 2 11 6. 6 8
Use a calculator to evaluate.
Order of Operations 7. 7 + 5 3
4
4
To see whether your calculator has the order of opera- 8. 12 - 8 4
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#
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tions built in, evaluate 5 + 2 3 by pressing the keys 5 9. 63 75 - 43 10
#
#
+ 2 * 3 = or ENTER . If the display 10. 8 22 + 7 16
#
reads 11 , your calculator does have the order of 11. 4(15 , 3 + 2) - 10 2
operations built in.This means that most of the time, you 12. 155 - 2(17 + 3) + 185

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