#### Answer

nonnegative

#### Work Step by Step

A radical expression with an even index, such as $\sqrt[4]{x},$ is a real number if $x$ is $0$ or a positive number (or $x$ is nonnegative.)

Published by
Pearson

ISBN 10:
0-32184-874-8

ISBN 13:
978-0-32184-874-1

nonnegative

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