Question 59059
Factor 9x^2 - 4y^2 .....
THIS RESEMBLES
A^2-B^2 = (A+B)(A-B)......
SO LET US TRY TO PUT IT INTO THAT FORM
=(3X)^2 - (2Y)^2 ...SO 
A=3X........B=2Y
HENCE WE GET
(3X+2Y)(3X-2Y)