For what range(s) of the adjustable parameter (mathrm{K}), do the following polynomials have all roots in the

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For what range(s) of the adjustable parameter \(\mathrm{K}\), do the following polynomials have all roots in the LHP ?

(a) \(s^{3}+(2+K) s^{2}+(8+K) s+6\)

(b) \(s^{4}+(10+K) s^{3}+3 s^{2}+9 s+11\)

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