What is the Solution for Canceling Out Terms in QM Calculation?

[athrun200]

Homework Statement

Homework Equations

3. The Attempt at a Solution

I almost get the answer as long as I can cancel out the first 2 terms.
But they are different, what can I do now?

 

[ardie]

now you do the integral

 

[dextercioby]

Isn't there supposed to be a minus in the Schroedinger equation ? (-hbar^2 / 2m d^2 psi / dx^2)

 

[ardie]

the first term will cancel after 2 applications of integration by parts. the second term will need some adjustment with Schrödinger equation and cancel out. at the end you end up with a term thatll look like the potential energy only from the Schrödinger equation.

 

[ardie]

i believe you can find the direct calculation on introduction to QM by griffiths, not certain though