1. Problem is given in the following link: http://s11.postimage.org/mrns0fu37/Problem.jpg 2. Relevant equations In my opinion open loop transfer function is given stable. So poles on RHS for open loop t.f. will be 0. But nyquist plot rotates (0,0) point by -360 . So thare will be one RHS open loop zero. Correct me if I am wrong.