Answer
$-126a\sqrt a$
Work Step by Step
We are given:
$-9\sqrt 28a^2 . \frac{1}{3}\sqrt 63a$
$=-9\sqrt 7.\sqrt 4a^2.\frac{1}{3}\sqrt 9.\sqrt 7.\sqrt a$
$=-9(\sqrt 7)^2.2a.\frac{1}{3}.3$
$=-126a\sqrt a$
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 - 10-2 Simplifying Radicals - Practice and Problem-Solving Exercises - Page 623: 31
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