What I need is to obtain a general expression for the roots of a cubic function when all of them are real.

What I need is to obtain a general expression for the roots of a cubic function when all of them are real.

This is a little confusing for me. In your example, why odes the output of solve (p) contain I. What does I mean in this case? Thanks a lot by the way.

This is a little confusing for me. In your example, why odes the output of solve (p) contain I. What does I mean in this case? Thanks a lot by the way.

Dear Edgardo,

Thank you very much for the detailed explanation.

Best,

Carlos

Dear Edgardo,

Thank you very much for the detailed explanation.

Best,

Carlos

@Preben Alsholm 

Thanks again!

@Preben Alsholm 

Thanks again!

Thanks a lot for you answer.

The function I am really interested in is O1(t) since this is the one that I actually can evalute experimentally. Could you please adapt your answer toward obtaining O1(t)? I am not interested in numerical solutions, I am trying to obtain a function I can fit to my experimental data.

Thanks again.

Thanks a lot for you answer.

The function I am really interested in is O1(t) since this is the one that I actually can evalute experimentally. Could you please adapt your answer toward obtaining O1(t)? I am not interested in numerical solutions, I am trying to obtain a function I can fit to my experimental data.

Thanks again.

Thanks for your reply.

Yes, numerically solving the system is quick. However, my problem is when getting the algebraic solution.

Thanks for your reply.

Yes, numerically solving the system is quick. However, my problem is when getting the algebraic solution.