Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 10 - Section 10.7 - Complex Numbers - Vocabulary and Readiness Check: 7



Work Step by Step

Step 1: $\sqrt -81$= $\sqrt -1\times\sqrt 81$ Step 2: Since $\sqrt -1=i$, the expression becomes $i\sqrt 81$ Step 3: Simplifying further, $i\sqrt 81$= $i\times9$ = $9i$
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