Roots on Imaginary Plane

Q.

Consider a unity feedback system, as in the figure shown, with an integral compensator $\frac{K}{s}$ and open-loop transfer function
$G\left(s\right)=\frac{1}{s^2+3s+2}$
where $K>0$ . The positive value of $K$ for which there are exactly two poles of the unity feedback system on the $j\omega$ is equal to (rounded off to two decimal places)

1. 6