1.

The root locus of the feedback control system having the real characteristic equation s2 + 6Ks + 2s + 5 = 0 where K > 0, enters into the real axis at

A. s = -1
B. \({\rm{s}} = - \sqrt 5\)
C. s = -5
D. \({\rm{s}} = \sqrt 5\)
Answer» C. s = -5


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