x²+2x-4y²+8y-3=

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x²+2x-4y²+8y-3=
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x²+2x-4y²+8y-3=
x²+2x-4y²+8y-3=

x²+2x-4y²+8y-3=
x²+2x-4y²+8y-3
=x²+2x+1-4y²+8y-4
=(x+1)²-4(y-1)²
=(x+1+2y-2)(x+1-2y+2)
=(x+2y-1)(x-2y+3)