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The characteristic equation of a system is 2s5+s4+4s3+2s2+2s+1=0 . Which one of the following is correct?

The characteristic equation of a system is 2s5+s4+4s3+2s2+2s+1=0 . Which one of the following is correct? Correct Answer Unstable

The solution is obtained by using the Routh-Hurwitz table in which with the conventional method the number of sign changes are seen in the first row of the table and number of sign changes is equal to the number of the roots on the right half of s plane.

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