Applicare la formula: $a+\frac{b}{c}$$=\frac{b+ac}{c}$, dove $a=1$, $b=-x^2$, $c=16$, $a+b/c=1+\frac{-x^2}{16}$ e $b/c=\frac{-x^2}{16}$

Applicare la formula: $1x$$=x$, dove $x=16$

Applicare la formula: $\left(\frac{a}{b}\right)^n$$=\frac{a^n}{b^n}$, dove $a=-x^2+16$, $b=16$ e $n=\frac{1}{2}$

Applicare la formula: $a^b$$=a^b$, dove $a=16$, $b=\frac{1}{2}$ e $a^b=\sqrt{16}$

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