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**[SOLVED] raising and lowering operators**

## Homework Statement

http://img125.imageshack.us/img125/2923/85098487ch9.jpg [Broken]

## The Attempt at a Solution

I expand a+ and a-, introduce the wavefunction and then substitute the values given at the very end to give:

http://img187.imageshack.us/img187/8224/37075232fm3.jpg [Broken]

This is where I'm stuck. I can't see how epsilon = 2mE/hbar comes into the equation. Are my initial calculations even correct?

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