What is the factorization of the expression below 9x^2-4y^2

A. (3x-2y) (3x-2y)

B. (9x-2y) (x+2y)

C. (3x-2y) (3x+2y)

D. (9x-2y) (x-2y)

Factors 9x^2-4y^2:

Rewrite 9x^2 as 3x^2 Hint: because 9/3=3

Rewrite 4y^2 as 2y^2 Hint: because 4/2=2

Remember whatever you do on one side you have to do the other.

Then you say: (3x) ^2 - (2y) ^2

Since both terms are perfect squares, factor using the difference of squares formula, a^2 - b^2 = (a+b) (a-b) = (3x+2y) (3x-2y)

Multiply 2 by - 1 to get:

C. (3x+2y) (3x-2y)

9x^2-4y^2

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

Choice C