Applicare la formula: $\frac{a}{b}$$=\frac{\frac{a}{fgrow\left(b\right)}}{\frac{b}{fgrow\left(b\right)}}$, dove $a=x^4-5$, $b=x^3-8$ e $a/b=\frac{x^4-5}{x^3-8}$

Applicare la formula: $\frac{a}{b}$$=\frac{splitfrac\left(a\right)}{splitfrac\left(b\right)}$, dove $a=\frac{x^4-5}{x^3}$ e $b=\frac{x^3-8}{x^3}$

Applicare la formula: $\frac{a}{a}$$=1$, dove $a=x^3$ e $a/a=\frac{x^3}{x^3}$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=x^3$, $a^m=x^4$, $a=x$, $a^m/a^n=\frac{x^4}{x^3}$, $m=4$ e $n=3$