Question 865798
2a^2+6a-12
3a^2+9a-9 

{{{(2a^2+6a-12)(3a^2+9a-9)}}}

 
{{{(2a(a+3)-12)(3a(a+3)-9)}}}

put (a+3)=b

(2ab-12)(3ab-9)

{{{6a^2b^2-18ab-36ab+108}}}

{{{6a^2b-54ab+108}}}

{{{6a^2(a+3)-54a(a+3)+108}}}

{{{6a^3+18a^2-54a^2-162a+108}}}

{{{6a^3-36a^2-162a+108}}}