Consider a feedback control system with a closed-loop transfer function of the form T(s) = P(s) Q(s); Q(s) = s3 + 4s2 + 6s + 4 (a) Determine, via mental / manual efforts, the roots of Q(s) [i. e., the poles of T(s). ] (5 points). (b) Then, construct / generate a Routh Table (RT) for Q(s) and qualitatively confirm the results obtained from the first task. (5 points)