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b^2+11b+28-b^2-2b+8
11b+28-2b+8
9b+36
P = (b^2 + 4b + 7b + 28) - (b^2 - 2b + 4b - 8)
P = (b^2 + 11b + 28) - (b^2 + 2b - 8)
P = b^2 - b^2 + 11b - 2b + 28 + 8
P = 9b + 36
P = 9 ( b + 4)
Espero que te sirva esta respuesta