I've got the solution to the question but I just need more detail. I can't work out the first step of the solution to the second step.
That should read, I don't know what they multiplied ih-bar by to make it (i/h-bar)^2?
I'm not a really strong physics student so I've came here for help mostly. I hope to improve on Quantum Mechanics and Electricity and Magnetism. I've done my 1st semester exams but not 2nd semester yet.