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x^2+x+15-y^2-2y -56
=x^2+x-56-(y^2+2y-15)
=(x^2+8x-7x-56)-(y^2+5y-3y-15)
=[x(x+8)-7(x+8)]-[y(y+5)-3(y+5)]
=[(x+8)(x-7)]-[(y+5)(y-3)]
=-(x+8)(x-7)(y+5)(y-3)
=x^2+x-56-(y^2+2y-15)
=(x^2+8x-7x-56)-(y^2+5y-3y-15)
=[x(x+8)-7(x+8)]-[y(y+5)-3(y+5)]
=[(x+8)(x-7)]-[(y+5)(y-3)]
=-(x+8)(x-7)(y+5)(y-3)
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