Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=z^{-5}$, $a^m=z^4$, $a=z$, $a^m/a^n=\frac{z^4}{z^{-5}}$, $m=4$ e $n=-5$

Simplify $\sqrt[6]{z^{9}}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $9$ and $n$ equals $\frac{1}{6}$

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=1$, $b=6$, $c=9$, $a/b=\frac{1}{6}$ e $ca/b=9\cdot \left(\frac{1}{6}\right)$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=9$, $b=6$ e $a/b=\frac{9}{6}$