Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n={\left(-8\right)}^4$, $a^m={\left(-8\right)}^7$, $a=-8$, $a^m/a^n=\frac{{\left(-8\right)}^7}{{\left(-8\right)}^4}$, $m=7$ e $n=4$

Applicare la formula: $a^b$$=a^b$, dove $a=-8$, $b=3$ e $a^b={\left(-8\right)}^{3}$