1. The problem statement, all variables and given/known data http://img24.imageshack.us/img24/9028/72841137.jpg [Broken] 2. Relevant equations Routh-Hurwitz Stability Criterion 3. The attempt at a solution For first question, you just write the Routh Array, make sure that the first row is all positive and you get Kmax = 1. Simple enough How would I approach the second question though? Any starters would be sincerely appreciated.