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Answer 1 · 2017-09-13T22:42:59

You can't.

$\frac{2}{u^{3}}$ $2/u^3$ can be written as $2 u^{- 3}$ $2u^-3$

Only fractional powers can be as radical expressions.

Examples:

$u^{\frac{1}{3}}$ $u^(1/3)$ could be expressed as $\sqrt[3]{u}$ $root(3)(u)$

$u^{\frac{1}{2}}$ $u^(1/2)$ could be expressed as $\sqrt{u}$ $sqrt(u)$

This is not conventional, but you could express it as follows:

$2 u^{- \frac{3}{1}} \Rightarrow \frac{2}{\sqrt[1]{u}}$ $2u^(-3/1) => 2/(root(1)(u))$

I have to confess I have never seen this used.