Answer
$-72y^{4}$
Work Step by Step
$(9y^{2})(-8y^{2})=(9\times-8)\times(y^{2}\times y^{2})=-72\times y^{2+2}=-72y^{4}$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.3 - Simplifying Radical Expressions - Exercise Set - Page 433: 104
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