Question

Can someone please tell me what r^2 - 9 = is?

Answer 1

The answer is (r + 3)(r - 3)

Explanation:

There need to be two number that add together to get 0

and two number that multiply together to get -9

3 + -3 = 0

3 · -3 = -9

= (r + 3)(r - 3)