Answer
$x^{2}+1$
Work Step by Step
Start with given expression: $|x^{2}+1|$
Since $x^{2}+1$ must be positive, the absolute value is the same as what is inside the absolute value:
$|x^{2}+1|=x^{2}+1 $
Calculus 8th Edition
by Stewart, James
Published by
Cengage
ISBN 10:
1285740629
ISBN 13:
978-1-28574-062-1
Appendix A - Numbers, Inequalities, and Absolute Values - A Exercises - Page A9: 11
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