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P = (a - 4)(a + 4) = a² - 16
b)
P = (2x + 3)(2x - 3) = 4x² - 9
c)
P = (2x - 5)(2x + 5) - (x - 3)(x + 3) = 4x² - 25 - x² + 9 = 3x² - 16