Hi, I literally just registered so I have no idea about forum rules, also I'm not good in english. 1. The problem statement, all variables and given/known data The equation is (x + 1)^2 dx. U = (x+1) DU = 1DX 2. Relevant equations 3. The attempt at a solution Here I get (U^3) over 3 times DX = (x^3 + 3x^2 + 3x + 1) over 3 times 1 I simplify to (x^3) over 3 + x^2 + x +1 + C The answer shows the same as my attempt but without the + 1 at the end. What happened to + 1 ?