Applicare la formula: $\left(a+b\right)^2$$=a^2+2ab+b^2$, dove $a=\frac{1}{5}x$, $b=\frac{-2a}{3}$ e $a+b=\frac{1}{5}x+\frac{-2a}{3}$

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

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

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=2$, $b=5$, $c=-2a$, $a/b=\frac{2}{5}$, $f=3$, $c/f=\frac{-2a}{3}$ e $a/bc/f=\frac{2}{5}x\frac{-2a}{3}$