A system with the characteristic equation s4 + 2s3 + 11s2 + 18s + 18 = 0 will have closed loop poles such that

no pole lie on the imaginary axis of the s-plane

all poles lie in the left half of the s-plane

all poles lie in the right half of the s-plane

two poles lie symmetrically on the imaginary axis of the s-plane

A system with the characteristic equation s4 + 2s3 + 11s2 + 18s + 18 =

1.	A system with the characteristic equation s4 + 2s3 + 11s2 + 18s + 18 = 0 will have closed loop poles such that
A.	all poles lie in the left half of the s-plane
B.	all poles lie in the right half of the s-plane
C.	two poles lie symmetrically on the imaginary axis of the s-plane
D.	no pole lie on the imaginary axis of the s-plane
Answer» D. no pole lie on the imaginary axis of the s-plane

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A system with the characteristic equation s4 + 2s3 + 11s2 + 18s + 18 = 0 will have closed loop poles such that

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