8(x²-2y²)-x(7x+y)+xy = (x²+5x+3)(x²+5x-2)-6
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8(x²-2y²)-x(7x+y)+xy = (x²+5x+3)(x²+5x-2)-6
8(x²-2y²)-x(7x+y)+xy = (x²+5x+3)(x²+5x-2)-6
8(x²-2y²)-x(7x+y)+xy = (x²+5x+3)(x²+5x-2)-6
8(x²-2y²)-x(7x+y)+xy
=8x²-16y²-7x²-xy+xy
=x²-16y²
=(x+4y)(x-4y)
(x²+5x+3)(x²+5x-2)-6
=(x²+5x)²-2(x²+5x)+3(x²+5x)-6-6
=(x²+5x)²+x²+5x-12
=(x²+5x-3)(x²+5x+4)
=(x²+5x-3)(x+1)(x+4)
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