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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.