Answer
$-9\sqrt 2+6\sqrt y$
Work Step by Step
The conjugate of $-9\sqrt 2-6\sqrt y$ is found by changing the sign between the two terms to positive. Therefore, the conjugate is $-9\sqrt 2+6\sqrt y$.
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 - Section 10.5 - Rationalizing Numerators and Denominators of Radical Expressions - Vocabulary and Readiness Check - Page 717: 10
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