Answer
$8(r - 4)(r + 4)$
Work Step by Step
First, we want to factor out the common term in the expression:
$8(r^2 - 16)$
This expression features the difference of two squares. The formula for factoring the difference of two squares is the following:
$a^2 - b^2 = (a - b)(a + b)$
In our expression, $a = r$ and $b = 4$.
Let's rewrite our expression in factor form:
$8(r - 4)(r + 4)$
