Using Routh’s stability criterion, answer the following parts: (a) Find how many roots with positive real parts are there for Q(s) = s 3 + s 2 + 20s + 78 = 0. (b) Find the range of K such that Q(s) = s 3 + 3Ks2 + (K + 2)s + 4 has all roots in the left half plane. (Here, K is a design parameter.)

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I don’t know just need some p o I n t s