E6.24 Consider the system represented in state variable form

(a) What is the system transfer function?

(b) For what values of k is the system stable?

where x(t) Ax(t) + Bu(t) y(t)=Cx(t) + Du(t), 0 1 0 A 0 0 1, B 0 -k -k -k C [100], D = [0].