Square root expressions with variables??? help

[brandonp777]

This is the problem I don't understand how to get (³√xⁿ)

 

[pka]

This is the problem I don't understand how to get (³√xⁿ)

I have no idea what this question means. Here is the notation:
\(\displaystyle \displaystyle\large\sqrt[3]{{{x^n}}} = {\left( {\sqrt[3]{x}} \right)^n} = {x^{\frac{n}{3}}}\)

 

[HallsofIvy]

You don't know how to get \(\displaystyle \sqrt[3]{x^n}\) from what?