Question

I need to combine and simplify this radical expression but forgot how... please help

Answer 1

$\bf \cfrac{1}{3}\sqrt[3]{81}\implies \cfrac{1}{3}\sqrt[3]{3^4}\implies \cfrac{1}{3}\sqrt[3]{3^{3+1}}\implies \cfrac{1}{3}\sqrt[3]{3^3\cdot 3^1}\implies \cfrac{1}{3}\cdot 3\sqrt[3]{3^1} \\\\\\ \sqrt[3]{3}$