Answer
See below.
Work Step by Step
The expression under the square root must be non-negative, thus $x^4-16\geq0\\x^4\geq16\\|x|\geq2$
So $x\geq2$ or $x\leq-2$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 5 - Section 5.4 - Polynomial and Rational Inequalities - 5.4 Assess Your Understanding - Page 374: 67
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