Question

Factor the expression completely.
8x2 - 18

Answer 1

2 ( 2x-3) (2x+3)

Explanation:

8x^2 - 18

Factor out a 2

2(4x^2 -9)

Inside the parentheses is the difference of squares

2 ((2x)^2 - 3^2)

We know the difference of squares is (a^2 -b^2) = (a-b)(a+b)

2 ( 2x-3) (2x+3)