What is the Resonant Frequency of a Driven, Undamped Oscillator?

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Driven, damped oscillator - URGENT!

Homework Statement


A driven, undamped oscillator has an amplitude of 3.0cm at a driving frequency of 9 rad/s and an amplitude of 2.4cm at a driving frequency of 7 rad/s. What is the resonant frequency of the oscillator?


Homework Equations


A = (F0/m)/(w0^2-w^2)


The Attempt at a Solution


My prof. gave me the above formula as a hint, but I have no idea where to start from and what to do. Thanks for the help!
 
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The resonant frequency is \omega_0. It looks like you have two formulas, and two unknowns: F_0 / m and \omega_0. Should be solveable.
 
I solved it, for some reason I just couldn't see it adn it was sitting in front of me lol. Thanks for the help!
 
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