Question: E 6 . 1 8 A system has a characteristic equation q ( s ) = s 3 + s 2 + 9 s +

E6.18 A system has a characteristic equation
q(s)=s3+s2+9s+9=0.
(a) Determine whether the system is stable, using the RouthHurwitz criterion. (b) Determine the roots of the characteristic equation.

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