The feedback system with characteristic equation s4 + 20 Ks3 + 5s2 + 1

1.	The feedback system with characteristic equation s4 + 20 Ks3 + 5s2 + 10s + 15 = 0 is
A.	stable for all value of K
B.	stable for positive value of K
C.	stable for > K > 7.0
D.	unstable for all values of K
Answer» E.

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The feedback system with characteristic equation s4 + 20 Ks3 + 5s2 + 10s + 15 = 0 is

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