GATE Electronics and Communications (EC) 2017 Shift 1 Solved Paper

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Question : 58 of 65

Marks: +1, -0

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

Four left half plane (LHP) roots
One right half plane (RHP) root, one LHP root and two roots on the imaginary axis
Two RHP roots and two LHP roots
All four roots are on the imaginary axis

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