Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n={\left(-7\right)}^{29}$, $a^m={\left(-7\right)}^{31}$, $a=-7$, $a^m/a^n=\frac{{\left(-7\right)}^{31}}{{\left(-7\right)}^{29}}$, $m=31$ e $n=29$

Applicare la formula: $a^b$$=a^b$, dove $a=-7$, $b=2$ e $a^b={\left(-7\right)}^{2}$