1)4y*(y-4)-(y-8)^2=4y^2-16y-(y^2-16y+64)=4y^2-16y-y^2+16y-64=3y^2-64 2)4b*(b+2)-(4+b)^2=4b^2+8b-(16+8b+b^2)=4b^2+8b-16-8b-b^2=3b^2-16