Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 7 - Section 7.7 - Complex Numbers - 7.7 Exercises - Page 491: 21


$-\sqrt 105$

Work Step by Step

$\sqrt -7\times\sqrt -15=i\sqrt 7\times i\sqrt 15=i^{2}\sqrt (7\times15)=i^{2}\sqrt 105=-1\times\sqrt 105=-\sqrt 105$ We know that $\sqrt -1=i$, because $i^{2}=-1$.
Update this answer!

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

Update this answer

After 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.