This was in my Introduction to modern physics exam, but i don't quite know what i should do here... My teacher said there was an easy trick. Can you guys help me? An electron is described by the following wave function ψ(x)=(ax+b for 0<x<L, cx+d for L<x<3L, 0 for x<0 V x>3L) a) Determine the constants a, b and c, and sketch the graph of Ψ. 3. The attempt at a solution I tried using the boundary conditions, but everything turns out being zero. Guys, please help me, i'm lost here.