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)

9x^2-4y^2

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

Choice C

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

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

Multiply 2 by -1 to get:

C. (3x+2y) (3x−2y)

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