#### Answer

$\sqrt[3] {25x^{2}}-81$

#### Work Step by Step

$(\sqrt[3] {5x}+9)(\sqrt[3] {5x}-9)$
=$(\sqrt[3] {5x})^{2}-(9)^{2}$
=$\sqrt[3] {(5x)^{2}}-81$
=$\sqrt[3] {25x^{2}}-81$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$\sqrt[3] {25x^{2}}-81$

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