The unit-step response of a unity feedback system with open loop transfer function G(s) = K/((s + 1) (s + 2)) is shown in the figure. The value of K2 + 2K +2 is ________
1
40
2
50
3
60
4
70
The unit-step response of a unity feedback system with open loop transfer function G(s) = K/((s + 1) (s + 2)) is shown in the figure. The value of K2 + 2K +2 is ________