1. The problem statement, all variables and given/known data [PLAIN]http://img823.imageshack.us/img823/4500/85131172.png [Broken] 2. Relevant equations Derivations and substitutions. 3. The attempt at a solution Basically it seems like a very simple problem to me however I can't seem to get the right answer. First I just assumed that the c.c. (complex conjugate) was just a constant thus: [tex]\Psi[/tex]'(x) = Ckeikx [tex]\Psi[/tex]''(x) = Ck2eikx But substituting that equation into the original DE gives: Ck2eikx = Ck2eikx + k2(c.c) obviously I'm missing something. edit: maybe I read the question wrong could c.c. mean Ce-ikx ???