Find the cube-root of 729.

Finding prime factors of 729:

$\sqrt[3]{729}\\[1em] = \sqrt[3]{(3 \times 3 \times 3)\times(3 \times 3 \times 3)}\\[1em] = 3\times3\\[1em] = 9$

Hence, $\sqrt[3]{729} = 9$