Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 7 - Section 7.1 - Radical Expressions and Graphs - 7.1 Exercises: 65

Answer

$|z|$

Work Step by Step

As shown on page 437, $\sqrt[n] a^{n}=|a|$ when $n$ is an even positive integer. In this case, we know that $\sqrt (-z)^{2}$ is equivalent to $\sqrt[2] (-z)^{2}$, since we are taking the square root. Therefore, we know that $\sqrt (-z)^{2}=\sqrt[2] (-z)^{2}=|-z|=|z|$.
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