Numerical 2 : Nyquist Plot , Closed Loop Stability , Limiting value of K

Numerical 2 on Nyquist Plot
2. Using Nyquist Criterion investigate the closed loop stability of system whose OLTF is given by G(𝑠)𝐻(𝑠)=(𝑲(𝒔+𝟏))/((𝒔+𝟎.𝟓)(𝒔−𝟐)) Consider K = 1.25 ; K = 2.5