Chapter 9 - Roots and Radicals - 9.4 - Products and Quotients Involving Radicals - Problem Set 9.4 - Page 418: 46

$3\sqrt[3]{x^2}$

Using the properties of radicals, the given expression, $ \sqrt[3]{9x}\sqrt[3]{3x} ,$ simplifies to \begin{array}{l} \sqrt[3]{9x(3x)} \\\\= \sqrt[3]{27x^2} \\\\= \sqrt[3]{27\cdot x^2} \\\\= \sqrt[3]{(3)^3\cdot x^2} \\\\= 3\sqrt[3]{x^2} .\end{array}