Answer
21
Work Step by Step
We use the rules of exponents to obtain:
$(-5)^{2}$ - $(0.5)^{-2}$ = $(-5)^{2}$ - $(\frac{1}{2})^{-2}$ = 25 - $(\frac{1^{-2}}{2^{-2}})$ = 25 - $2^{2}$ = 25 -4 = 21
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 7 - Exponents and Exponential Functions - 7-1 Zero and Negative Exponents - Practice and Problem-Solving Exercises - Page 423: 67
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