factories 2y³+y²-2y-2
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Factorise by grouping
2y^3+3y^2+y-2y^2-3y-1
y(2y^2+3y+1)-1(2y^2+3y+1)
(y-1)(2y^2+3y+1)
(y-1)(2y+1)(y+1)
2y^3+3y^2+y-2y^2-3y-1
y(2y^2+3y+1)-1(2y^2+3y+1)
(y-1)(2y^2+3y+1)
(y-1)(2y+1)(y+1)
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