(Solved): The characteristic equation of a closed-loop control system is given as \( s\left(s^{2}+2 s+7\righ ...

The characteristic equation of a closed-loop control system is given as \( s\left(s^{2}+2 s+7\right)+K=0 \) where \( K \) is a real number. Calculate the angle of departure (in degrees) from the complex pole that lies in the top half of complex plane. The range of angle is supposed to betwe \( 180^{\circ} \). Write the numeric answer below. Keep two decimal places. No unit is needed. Correct Answer: \( \quad-22.21 \pm 10 \% \)