e) x^3 + 3x^2 + 3x + 1 – y^3;

e) x3 + 3x2 + 3x + 1 – y3 = (x + 1)3 – y3

= (x + 1 – y)[(x + 1)2 + (x + 1)y + y2]

 = (x – y + 1)(x2 + 2x + 1 + xy + y + y2);