GATE EC 2017 Q48: Roots of s⁴+s²+1=0 on Complex Plane | ExamPrev

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EC > GATE 2017 SET-1 > Root Locus

Which one of the following options correctly describes the locations of the roots of the equation s⁴+s²+1=0 on the complex plane?

A

Four left half plane (LHP) roots

B

One right half plane (RHP) root, one LHP root and two roots on the imaginary axis

C

Two RHP roots and two LHP roots

D

All four roots are on the imaginary axis

Correct : c

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