因式分解:x2-y2+2x-4y-3救命啊

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因式分解:x2-y2+2x-4y-3救命啊

因式分解:x2-y2+2x-4y-3救命啊
因式分解:x2-y2+2x-4y-3
救命啊

因式分解:x2-y2+2x-4y-3救命啊
x²-y²+2x-4y-3
=(x²+2x+1)-(y²+4y+4)
=(x+1)²-(y+2)²
=[(x+1)-(y+2)][(x+1)+(y+2)]
=(x-y-1)(x+y+3)

x^2-y^2+2x-4y-3
=(x^2+2x+1)-(y^2+4y+4)
=(x+1)^2-(y+2)^2
=[(x+1)-(y+2)][(x+1)+(y+2)]
=(x-y-1)(x+y+3)