Factorise: (i) x^3-2x^2-x+2 (ii) x^...

Factorise: (i) `x^3-2x^2-x+2` (ii) `x^3-3x^2-9x-5` (iii) `x^3+13 x^2+32 x+20` (iv) `2y^3+y^2-2y-1`

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`(i) x ^ 3 −2x ^ 2 −x+2
=x ^ 2 (x−2)−1(x−2)
...

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