Question

simplify r^2-4/(r+2)^2

Answer 1

Use the identity :
a^2-b^2=(a+b)(a-b)

On the top part of the fraction

Answer 2

assuming the question is:

(r^2-4)/((r+2)^2)

Answer 3

\[\frac{r^2-4}{(r+2)^2} = \frac{(r+2)(r-2)}{(r+2)^2}\]now cancel out the r+2
\[= \frac{r-2}{r+2}\]