8(x²-2y²)-x(7x+y)+xy

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8(x²-2y²)-x(7x+y)+xy
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8(x²-2y²)-x(7x+y)+xy
8(x²-2y²)-x(7x+y)+xy

8(x²-2y²)-x(7x+y)+xy
8(x²-2y²)-x(7x+y)+xy
=8x^2-16y^2-7x^2-xy+xy
=x^2-16y^2
=(x+4y)(x-4y)