Question

How do you simplify `(sqrtx+3)(sqrtx-3)`?

Answer 1

x - 9

Explanation:

We know `(a+b)(a+b) = a^2 -b^2`

So `(sqrt x + 3)(sqrt x - 3) = (sqrt x)^2 - (3)^2 = [x^(1/2)]^2 - 9 = x - 9`