How do I show the frequency on a Damped Harmonic Oscillator is sqrt(k/m)?

[phatj]

as title says... assuming the equation for a damped harmonic oscillator is

my'' + by' + ky = 0

 

[Heisenberg]

The frequency for a damped oscillator isn't simply equal to Sqrt(k/m) like in the standard oscillator case.

 

[audi]

fourty seven times x equals fourty seven times three what is x equivalent toQUESTIONMARK

 

[TuxDave]

Solve the characteristic equation and for the underdamped harmonic oscillator, assume b small to give two imaginary roots.