Write a Matlab function which, when given the numerator and denominator of an open loop system transfer function, finds the poles of the closed loop system when unity negative feedback is applied. For instance, if the open loop system transfer function is G(s) = (s + 2) / (s^2 + 2s + 3) the inputs to your function will be num = [1 2] and den = [1 2 3]. The function should output -1.5000 + 1.6583i and -1.5000 - 1.6583i, which are the closed loop poles of the unity negative feedback system G(s) = G(s) / (1 + G(s))
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