Consider a negative unity feedback system with the forward path transfer function \(\frac{{{s^2} + s + 1}}{{{s^3} + 2{s^2} + 2s + K}}\), where K is a positive real number. The value of K for which the system will have some of its poles on the imaginary axis is ________

Consider a negative unity feedback system with the forward path transf

1.	Consider a negative unity feedback system with the forward path transfer function \(\frac{{{s^2} + s + 1}}{{{s^3} + 2{s^2} + 2s + K}}\), where K is a positive real number. The value of K for which the system will have some of its poles on the imaginary axis is ________
A.	9
B.	8
C.	7
D.	6
Answer» C. 7