#### Answer

$9\sqrt{x^2+1}$

#### Work Step by Step

Factor the radicand so that one of the factors is a perfect square to obtain:
$=\sqrt{81(x^2+1)}
\\=\sqrt{9^2(x^2+1)}$
Simplify the radical to obtain:
$=9\sqrt{x^2+1}$

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

$9\sqrt{x^2+1}$

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.