x-2xy-1+4y²

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x-2xy-1+4y²x-2xy-1+4y²x-2xy-1+4y²=x(1-2y)-(1+2y)(1-2y)=(1-2y)(x-1-2y)

x-2xy-1+4y²
x-2xy-1+4y²

x-2xy-1+4y²
=x(1-2y)-(1+2y)(1-2y)
=(1-2y)(x-1-2y)