factorization PLEASE HELP!!!

ARE THESE EQUATION FACTORABLE??? IF YES, PLEASE FACTORIZE:
(a) 4x^2 8x + 32
(b) x^6 2x^3 + 1
(c) 3(4x + 5)2
4(5x + 1)2 + (4x + 5)3
2(5x + 1)
5
(d) x^4 -1
(e) x^3 + 2x^2 -x - 2