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

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

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