Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=\left(3x\right)^2$, $a^m=\left(3x\right)^4$, $a=3x$, $a^m/a^n=\frac{\left(3x\right)^4}{\left(3x\right)^2x^2}$, $m=4$ e $n=2$

Applicare la formula: $\left(ab\right)^n$$=a^nb^n$

Applicare la formula: $a^b$$=a^b$, dove $a=3$, $b=2$ e $a^b=3^{2}$

Applicare la formula: $\frac{a}{a}$$=1$, dove $a=x^{2}$ e $a/a=\frac{9x^{2}}{x^2}$