Back calculating frequency in impedance

[pion64]

I have been after a answer to this question for 12 months now and no one has come close to answering it.
I would like to know if there is any way of re-aranging the formula below to back calculate the frequency.
I can rearange the fomula to get any one of the other input values back, except (F) freqency.

((R*R)+(((K*F*L)-(1E6/(K*F*C)))**2))**.5

parenethesies logic flow = blue red yellow
The standard series impedance equation is below. The one above is how I enter it in to my psion calculator and follows the numbers.

R squared + ( XL - XC ) squared then all square rooted


R= resistance K= a constant of 2times pie F= frequency C= capacitance L=inductance
**2 means square root and **.5 means all rooted.
I would be grateful for any help, but I wont hold my breath as I think it would take some one with at least a Phd in quadratic equations.

please send your replies directly to me at (e-mail address removed)
Regards
John (Sheffeild)

 

[ChristopherP]

Why do you need to know this?!

 

[gabriella]

What is all this about? Is it a maths quiz????

Gabriella x

 

[KGB-911]

You may want to color code the brackets, so we know which goes with what

 

[Techy]

where's abert einstein when you need him!!!!!!!!!!!!!!!!!

i haven't got a clue.

reckon ian might know!

 

[Me__2001]

if you colour code the brackets i might be able to help

 

[ChristopherP]

Whos abert?

 

[KGB-911]

haha!!! (In a sarcastic tone)

albert, chris, albert!

 

[frombadtraverse]

I would think it would be something like F=R+((L+C)/6.28). I could be wrong as it's been 30 years since I've really had to do this. But then I think you probably don't need this answer anymore as it's been almost a month now.