#### Answer

$-63x^3\sqrt 3$

#### Work Step by Step

Separate the radical to make the expression easier to simplify.
$-21\times\sqrt 9\times\sqrt 3\times\sqrt x^9$
Simplify
$-21\times 3\times\sqrt 3\times x^3$
Answer: $-63x^3\sqrt 3$

Published by
Prentice Hall

ISBN 10:
0133281140

ISBN 13:
978-0-13328-114-9

$-63x^3\sqrt 3$

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