Answer
4
Work Step by Step
$\sqrt[n] a$ can be written as $a^{1/n}$.
$\sqrt[4] {256}=256^{1/4}$
$\sqrt[4] {256}=4$
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter R - Section R.7 - Radical Expressions - R.7 Exercises - Page 66: 4
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