9 Figure 4.15 shows a feedback control system with unity feedback.
Will the system be stable when (a) K = 1, G(s) = 1/[s(s + 1)], (b) K =
3, G(s) = 1/[s + 4)(s- 1)], (c) K = 5, G(s) = 1/[s + 4)(s- 1)]?
10 State if the following systems are stable, the relationship between
input x and output y being described by the differential equations :