Theory of elastic stability - Critical axial force value

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https://dl.dropbox.com/u/73421703/b1.jpg hi there , I'm asking for help with this one! I should solve that problam through energy method.
Given single force Q(not shown in the picture) on the edge of the cantilever(the right-end of the beam), what I'm looking for - The critical P(axial force) that beam can absorb. the answer is in Euler form.

any suggestions would help!

p.s
sorry for the poor english.
 
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You must be given the beam properties. Then it's fa/Fa + fb/Fb = 1. With appropriate safety factors. I assume Q is applied perpendicular to beam. Please show attempt.