Resonace frequency

[ssato]

Hello everyone

I want to get the resonace frequency by L-C-R series circuit.

I tried 5 method. Please see attached file.

But I can not get the correct frequency by No.2,3,4,5 in this file.

Please explain...

[ttokoro]

Prime 5

[ssato]

Hello ttokoro san

 I understood I need "assume" condition.

I tried Mathcad 15. In this case I needed "assume,ALL>0" in all case.

In No.5 , I could not get the answer  without unit.

[-MFra-]

[Werner_E · Accepted solution]

The attached file may help

[ssato]

Hello Werner_E san

I understood SOLVE BLOCK or ROOT is good solution.

Thank you for your reply.