Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=x^2$, $b=16$, $c=-x^4$, $a/b=\frac{x^2}{16}$, $f=16$, $c/f=\frac{-x^4}{16}$ e $a/bc/f=\frac{x^2}{16}\frac{-x^4}{16}$

Applicare la formula: $ab$$=ab$, dove $ab=16\cdot 16$, $a=16$ e $b=16$

Applicare la formula: $x^mx^n$$=x^{\left(m+n\right)}$, dove $m=2$ e $n=4$

Applicare la formula: $a+b$$=a+b$, dove $a=2$, $b=4$ e $a+b=2+4$