Answer
See below.
Work Step by Step
$x^4+1\lt-5$ is the same as $x^4\lt-6$, but we know that $x^4=(x^2)^2\geq0$, thus the original inequality has no solution.
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: 81
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