Answer
-24
Work Step by Step
We are given: $(2\sqrt 5-6)(9+3\sqrt 5)$
$=2(\sqrt 5-3)3(3+\sqrt 5)$
$=6(5-3^2)$
$=-24$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 10 - Radical Expressions and Equations - 10-4 Solving Radical Equations - Practice and Problem-Solving Exercises - Page 638: 58
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