Hi

I have this equation:

$\displaystyle s^2 + \sqrt{2}s + 4$

and it somehow factorises to this:

$\displaystyle (s + 2e^{+j(\pi/4)})(s + 2e^{-j(\pi/4)})$

I've tried using the quadratic formula but cant get it into the form with $\displaystyle e^{x}$

Would anyone be able to shed a little light on this?

Thanks