Answer
$87$
Work Step by Step
$(\sqrt 6-9i)(\sqrt 6+9i)$
=$(\sqrt 6)^{2}-(9i)^{2}$
=$6-81i^{2}$
=$6-81(-1)$
=$6+81$
=$87$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Review - Page 749: 138
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