Question

Factor completely 9x^2-4

Answer 1

I think you means

9x² - 4 which is a difference of squares

difference of squares

a² - b² can be factored as (a + b)(a - b)

so

9x² - 4

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

Answer 2

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

When multiplied out it equals the original expression