1. The problem statement, all variables and given/known data 2. Relevant equations -h^2/2m d^2F(x)/dx^2 = EF(x) 3. The attempt at a solution i just need to a part. for E<0 i can find for 0<x<L side F(x) = ACos(Lx) + BSin(Lx) at the L<x side, F(x) = e^(Kx) where L^2= 2m(E+V)/h^2 K^2= -2mE/h^2 but i do not know what will i do. can you help me for a part of question.