因式分解:(y+1)(y²-1)-(y+1)²

因式分解:(y+1)(y²-1)-(y+1)²
因式分解:(y+1)(y²-1)-(y+1)²

因式分解:(y+1)(y²-1)-(y+1)²
您好：
(y+1)(y²-1)-(y+1)²
=(y+1)[y²-1-y-1]
=(y+1)(y²-y-2)
=(y+1)(y-2)(y+1)
=(y-2)(y+1)²

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(y+1)(y²-1)-(y+1)²
=(y+1)(y+1)(y-1)-(y+1)²
=(y+1)²(y-1)-(y+1)²
=(y+1)²[(y-1)-1]
=(y+1)²(y-2)

(y+1)(y^2-1)-(y+1)^2
=(y+1)^2(y-1)-(y+1)^2
=(y+1)^2(y-2)