factorise y^3+y^2-y-1
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y^3+y^2-y-1
=y^2(y+1)-(y+1)
=(y+1)(y^2-1)
=(y+1)(y+1)(y-1)=ANSWER
=y^2(y+1)-(y+1)
=(y+1)(y^2-1)
=(y+1)(y+1)(y-1)=ANSWER
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