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b) (2x + 1)² = 4x² + 4x + 1 Binomio al cuadrado
c) (x² - 16) = (x - 4) (x + 4) diferencia de cuadrados
d) (4x² - 9) = (2x - 3) (2x + 3) diferencia de cuadrados
e) (x + 3) (x - 9) = x² - 9x + 3x - 27 Simplificar = x² - 6x - 27