factotise y^3+y^2 -y-1
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y³+y²-y-1
y²(y+1) -1(y+1)
(y+1) (y²-1)
(y+1) (y+1) (y-1)
y²(y+1) -1(y+1)
(y+1) (y²-1)
(y+1) (y+1) (y-1)
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