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The given characteristic equation s^4+s^3+2s^2+2s+3=0 has:

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The given characteristic equation s^4+s^3+2s^2+2s+3=0  has:

(a) Zero root in the s-plane

(b) One root in the RHS of s-plane

(c) Two root in the RHS of s-plane

(d) Three root in the RHS of s-plane

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Question is from Stability Analysis in division Digital Control Systems of Control Systems

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The correct answer is (c) Two root in the RHS of s-plane

Best explanation: The stability analysis is done using Routh-Hurwitz criterion and hence the number of roots on the right is calculated.

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