How do you factor 9a^2b^2 - 4a^2 - 12ab + 4 ?

1 Answer
Oct 28, 2017

(3ab-2+2a)(3ab-2-2a)

Explanation:

Given, 9a^2b^2-4a^2-12ab+4
rArr 9a^2b^2-12ab+4-4a^2
rArr (3ab)^2-2.3ab.2+(2)^2-(2a)^2
rArr (3ab-2)^2-(2a)^2
rArr [(3ab-2)+2a][(3ab-2)-2a]
rArr (3ab-2+2a)(3ab-2-2a)