Answer
All real numbers, $x\ne+1,-1$
Work Step by Step
$$x^{4}-1=0$$
$$x^{4}=1$$
$$\sqrt[4] (x^{4})=\sqrt[4] 1$$
$$x=+1,-1$$
We have to be careful that we include -1 here.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 5 - Section 5.2 - Properties of Rational Functions - 5.2 Assess Your Understanding - Page 351: 22
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