Question

Please help. http://i58.tinypic.com/30csr51.png
Explain the steps.
Walk me through it PLEASE!

Answer 1

Ah. Break up the root. One of the property of root is that \(\sqrt[n]{xy}=\sqrt[n]{x}\sqrt[n]{y}\)

Answer 2

\( \Large \sqrt[3]{72x^5y^8}=\sqrt[3]{(2^3\times9)(x^3\times x^2)(y^3\times y^3\times y^2)}\\\Large =\sqrt[3]{2^3x^3y^3y^3}\times \sqrt[3]{9x^2y^2}=2xy^2\ \sqrt[3]{9x^2y^2}\)