# I'm trying to wokout a problem and my answer does not match the books. Factor by grouping 42a^2b-56a^2-12ab+16a. the answer is 2a(3b-4)(7a-2). so far I have 2a(7a-2) (3b-4) (-3b+4)

Question

I'm trying to wokout a problem and my answer does not match the books. Factor by grouping 42a^2b-56a^2-12ab+16a. the answer is 2a(3b-4)(7a-2). so far I have 2a(7a-2) (3b-4) (-3b+4)