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(x-2) - (y-2) - (x-y) = [(x-2)-(y-2)][(x-2) + (x-2)(y-2) +(y-2)] - (x-y) =(x-y)(x -4x +4 +xy -2x -2y +4 +y-4y+4) - (x-y) =(x-y)[(x+y-6x-6y+xy+12)-(x-y)] =(x-y)(x+y-6x-6y+xy+12 - x -y +2xy) =(x-y)(3xy -6x -6y +12) =3(x-y)(xy-2x-2y+4) =3(x-y)(x-2)(y-2)
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