Question 609861
I'm confused about how to factor this problem..Please show me the steps to getting this answer thanks! 
Factor: 12a^2-4bc+16ac-3ab
group terms with coefficients that have common multiples
-3ab+12a^2-4bc+16ac
-3a(b-4a)-4c(b-4a)
(b-4a)(-3a-4c)
-(3a+4c)(b-4a)