pls help
(a) Describe the characteristics of an unstable system. You may sketch a diagram or a graph to illustrate your answer. (b) Determine if the system with the following characteristic equation is stable: – (s + 1)(s + 2)(s – 3) = 0 (c) Given the function below, determine the range of K for stability, assuming K is positive. G(s)H(s) = K/s(s + 2)(s + 4)(s + 8)