Answer
$\frac{5}{2}\sqrt[3] {7x}$
Work Step by Step
$\sqrt[3] {\frac{7x}{8}}+2\sqrt[3] {7x}$
=$\frac{\sqrt[3] {7x}}{\sqrt[3] 8}+2\sqrt[3] {7x}$
=$\frac{\sqrt[3] {7x}}{2}+2\sqrt[3] {7x}$
=$\sqrt[3] {7x} (\frac{1}{2}+2)$
=$\sqrt[3] {7x} (\frac{5}{2})$
=$\frac{5}{2}\sqrt[3] {7x}$
