2A(A-B)=2(3y-6x+5)(3y-6x+5-4y-7x+6)
=(6y-12x+10)(-y-13x+11)
=-6y^2-78xy+66y+12xy+156x^2-132x-10y-130x+110
=-6y^2+156x^2-66xy+56y-262x+110
2A(A-B)=2(3y-6x+5)(3y-6x+5-4y-7x+6)
=(6y-12x+10)(-y-13x+11)
=-6y^2-78xy+66y+12xy+156x^2-132x-10y-130x+110
=-6y^2+156x^2-66xy+56y-262x+110