Applicare la formula: $\left(a+b\right)^2$$=a^2+2ab+b^2$, dove $a=\frac{7}{9}x^3$, $b=-\frac{3}{5}x$ e $a+b=\frac{7}{9}x^3-\frac{3}{5}x$

Applicare la formula: $x\cdot x^n$$=x^{\left(n+1\right)}$, dove $x^nx=\frac{14}{9}\cdot -\frac{3}{5}x^3x$, $x^n=x^3$ e $n=3$

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

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=14$, $b=9$, $c=-3$, $a/b=\frac{14}{9}$, $f=5$, $c/f=-\frac{3}{5}$ e $a/bc/f=\frac{14}{9}\cdot -\frac{3}{5}x^{4}$