How many roots with positive real parts do the equation s^3+s^2-s+1=0 have?(a) 0(b) 1(c) 2(d) 3The question was posed to me in unit test.Origin of the question is Compensation Techniques in section Digital Control Systems of Control Systems

How many roots with positive real parts do the equation s^3+s^2-s+1=0

1.	How many roots with positive real parts do the equation s^3+s^2-s+1=0 have?(a) 0(b) 1(c) 2(d) 3The question was posed to me in unit test.Origin of the question is Compensation Techniques in section Digital Control Systems of Control Systems
Answer» The correct OPTION is (c) 2 Best EXPLANATION: The roots with positive real PARTS are calculated with the help of the routh-hurwitz table and since the sign changes two TIMES in first COLUMN therefore have two roots have positive parts.

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How many roots with positive real parts do the equation s^3+s^2-s+1=0 have?(a) 0(b) 1(c) 2(d) 3The question was posed to me in unit test.Origin of the question is Compensation Techniques in section Digital Control Systems of Control Systems

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