0 0 votes The characteristic equation for a system is $S^{3}+9S^{2}+26S+12(2+K{_c}) = 0$. Using the Routh test, the value of $K{_c}$ that will keep the system on the verge of instability is $20.9$ $18.4$ $17.5$ $15.3$ Instrumentation and Process Control gate2012 analytical-aptitude process-calculations-and-thermodynamics + – Milicevic3306 8.0k points answer Follow 0 reply