Answer
$8i\sqrt 5$
Work Step by Step
$4\sqrt(-20)=4\sqrt(4\times-1\times5)=4(\sqrt 4\times\sqrt -1\times\sqrt 5)=4(2i\sqrt 5)=8i\sqrt 5$
We know that $\sqrt -1=i$, because $i^{2}=-1$.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 463: 14
Update this answer!
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.
