Answer
$\sqrt{(-9)\cdot(-9)}$ does not equal $\sqrt{(-9)}\cdot\sqrt{(-9)}$
Work Step by Step
$\sqrt{(-9)}\cdot\sqrt{(-9)} =3i\cdot 3i=9i^{2}=9(-1)=-9$,
while
$\sqrt{(-9)\cdot(-9)}=\sqrt{81}=+9$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 1 - Section 1.3 - Complex Numbers; Quadratic Equations in the Complex Number System - 1.3 Assess Your Understanding - Page 112: 97
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.
