5. Factorise:

(i) \(p(x)=x^3-2x^2-x+2\)  

(ii) \(p(x)=x^3-3x^2-9x-5\)

(iii) \(p(x)=x^3+13x^2+32x+20\)

(iv) \(p(y)=2y^3+y^2-2y-1\)