Question

Factor 9b^2 - 4.

(3b + 1)(3b - 4)
(3b + 2)(3b - 2)
(3b - 2)(3b - 2)

Answer 1

So for this, we will be applying the difference of squares, which is
`x^2-y^2=(x+y)(x-y)`

In this case:

`9b^2-4=(3b+2)(3b-2)`

The correct answer is the second option.

Answer 2

The answer should be (3b + 2)(3b - 2) since if you multiply those two, you will get back to original equation.

Hope this helps!