Algebra 1: Common Core (15th Edition)

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: 67

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
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