## Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole

# Chapter 1 - Section 1.2 - Exponents and Radicals - 1.2 Exercises: 18

#### Answer

a) -125 b) -125 c) 4

#### Work Step by Step

Note that parenthesis matter: a) $(-5^{3})$ = (-5) $\times$ (-5) $\times$ (-5) = -125 b) $-5^{3}$ = - ($5^{3}$) = -(125) = -125 c) $(-5^{2})$ $\times$ ($\frac{2}{5}$)$^{2}$= 25 $\times$ $\frac{4}{25}$ = 4

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