## irreducible polynomials

(a)What are the irreducible polynomials in:
(i) C[x]
(ii) R [x]
(iii) Z[x]
in terms of the irreducibe of Z and Q[x]
(b) Factorize x^5 + 2x^4- 3x^2 - 4x -2 into irreducible in each of (i) Z[x], (ii) Q[x], (iii)R [x], (iv) C[x]

Can you give me some hints please?
Thank you very much