Deriving Relativistic Energy Problem

[HPRF]

Homework Statement

Taking into account the electrons momentum and relativistic energy prove that W=(m(sub0)^2c^4+p^2c^2)^(1/2)

Homework Equations

p=(gamma)m(sub0)v; W=(gamma)m(sub0)c^2.

The Attempt at a Solution

I have tried expanding the relativistic factor gamma=(1/(1+v^2/c^2))^1/2 but got nowhere. I'm wondering if I need to bring in another equation

 

[clamtrox]

It might be easier to derive the answer if you had W and p in one side of the equation.

 

[HPRF]

Thanks for the advice. I've managed to solve it...!

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