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the equation i have is s

^{2}+ 2s + 8 / s(s

^{2}+ 2s + 10)

so the zeros are -1 + i√7 and -1 - i√7

and the poles are 0, -1 + 3i, -1 - 3i

and the centroid = (0 - 1 - 1) - (-1 -1) / (3-2) = 0

in my textbook they say that the answer is -2.. am i missing something?

my textbook has been wrong before........