21. For the unity feedback system of Figure P8.3, where G(s) K(s-1)(s-2) = s(s+1) sketch the root locus and find the following: [Section: 8.5] a. The breakaway and break-in points b. The jw-axis crossing c. The range of gain to keep the system stable d. The value of K to yield a stable system with second-order complex poles, with a damping ratio of 0.5