Remember this.
[tex] {x}^{ - a} = \frac{1}{ {x}^{a} } [/tex]
[tex] \sqrt[a]{ {x}^{b} } = {( {x}^{b} )}^{ \frac{1}{a} } [/tex]
So,
[tex] {x}^{ - \frac{5}{3} } \\ = \frac{1}{ {x}^{\frac{5}{3} } } \\ = \frac{1}{ {({x}^5)}^{\frac{1}{3} } } \\ = \frac{1}{ \sqrt[3]{ {x}^{5} } } [/tex]
