Simplify E_c = (m 4pi^2 k^2 e^2)/(2 h^2 n^2) - (4pi k^2 e^4)/(n^2 h^2)

If you're simply trying to factor, then I would write:

[MATH]E_C=\frac{2\pi k^2e^2}{h^2n^2}\left(\pi m-2e^2\right)[/MATH]
 
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