Please help with the following question:

(a) Consider the potential where V(:I:) = 0 for 3: S 0 and V(:r:) = Vb for :I: > 0. Show that the energy eigenfunctions with E > V\" can be written in the form w = A [(akw + EH) taux) + games) , (5) where 901:) is the step function 9(zr)={1 :I:>0, (6) 0 i13