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P - pole = (x + 2)(x + 2) = (x + 2)²
b)
P - pole = (1/4 + a)(1/4 + a) = (1/4 + a)²
c)
P - pole = (2x + 1)(2x + 1) + (x + 2)(x + 2) = (2x + 1)² + (x + 2)² =
= 4x² + 4x + 1 + x² + 4x + 4 = 5x² + 8x + 5