How Do You Calculate Energy Levels in a 3-D Infinite Potential Well?

[klhall2]

For the second, third, fourth, and fifth levels of the three-dimensional cubical box, find the energies in terms of the quantity Eo=π2*h2/(2mL2), where m is the particle mass and L is the box's sidelength.

 

[ManyNames]

Come now, this is standard homework. The reason probably why you haven't got an answer is because you've made no attempt in solving it yourself.