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

Applicare la formula: $\lim_{x\to c}\left(a^b\right)$$={\left(\lim_{x\to c}\left(a\right)\right)}^{\lim_{x\to c}\left(b\right)}$, dove $a=-\frac{8}{3}$, $b=x$ e $c=\infty $

Applicare la formula: $\lim_{x\to c}\left(a\right)$$=a$, dove $a=-\frac{8}{3}$ e $c=\infty $

Applicare la formula: $n^{\infty }$$=- \infty $, dove $n=-\frac{8}{3}$