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P-10.6 For the following feedback filters, determine the locations of the poles and zeros and plot the positions in the z-plane: (a) y[n] = {y[n – 1] + ży[n – 2] – x[n] + 3x[n – 1] – 2x[n – 2] (b) y[n] = {y[n – 1] – ży[n – 2] – x[n] + 3x[n – 1] + 2x[n – 2] In part (b), only the signs on y[n – 2] and x[n – 2] were changed from those in part (a). Compare the two results.