Answer
He multiplied the exponents.
Work Step by Step
From the final expression, we see that he ends up with 3/5 as an exponent. However, when two identical bases are multiplied, their exponents are added, not multiplied.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 10 - Exponents and Radicals - 10.5 Expressions Containing Several Radical Terms - 10.5 Exercise Set - Page 662: 119
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