The positive value K of will have K for zeroes which
The positive value K of will have K for zeroes which $\left[ {1 + \dfrac{K}{{(s + 1)(s + 2)}}} \right]$ on the right-half of the complex s-plane is
Right Answer is:
No such K exists
SOLUTION
Applying Routh-Hurwitz criterion
(s + 1)(s + 2) + K = 0
s2 + 3s + (2 + K) = 0
For K > 0, no such value exists so that zeros lies in the right half of the s-plane.