from the document above i found on the net, problem 9.2.1, the section which says 7.2 pair of pure imag...

i am trying recreate that problem on matlab.. in my code i tried replacing my characteristic equation shown shown on the previous page of the document i.e. lambda^3...etc with Lambda = i*real(w) like it says in that document, and tried making w the subject of formula..

but it wont work...can anyone create a code to get that w^2 =... like they have in that document or give me tips on how to do it