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Caso.
Factor Comun.
28x² - 12x - 16x + 12 =
28x² - 28x + 12 = Sacas factor comun 4
4(7x² - 7x + 3)
Factor comun por agrupacion de terminos.
ma + mb - na - nb = Agrupas
(ma + mb) - (na + nb) = Sacas factor comun m y n
m(a + b) - n(a + b) = Sacas factor comun (a + b)
(a + b)(m - n)