Answer
$\sqrt[3] {25x^{2}}-81$
Work Step by Step
$(\sqrt[3] {5x}+9)(\sqrt[3] {5x}-9)$
=$(\sqrt[3] {5x})^{2}-(9)^{2}$
=$\sqrt[3] {(5x)^{2}}-81$
=$\sqrt[3] {25x^{2}}-81$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.