Partial differential equation. Please help

[sharonny]

(? + ?) ??? + 2????? - ?²??? = 0
Examine the equation according to the m parameter.

 

[Steven G]

Where are you stuck? What have you tried? It is extremely hard to help you solve your problem if we have no idea what type of help you need. If you had followed the forum guidelines you would have received help by now. Please post back with showing your attempt with this problem.