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)
