Answer
$x^5$
Work Step by Step
$\sqrt[4] x^{20}=x^5$
because,
$(x^5)^4=x^{20}$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Section 10.1 - Radical Expressions and Radical Functions - Exercise Set - Page 686: 42
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