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

Applicare la formula: $x\cdot x^n$$=x^{\left(n+1\right)}$, dove $x^nx=\frac{2}{3}\cdot -\frac{2}{3}x^2x$, $x^n=x^2$ e $n=2$

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

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