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Caso.
Factor común.
27m² - 3 = Sacas factor común 3
3(9m² - 1) = En el parentesis aplicas diferencia de cuadrados
a² - b² = (a + b)(a - b)
3(3²m² - 1) =
3(3m + 1)(3m - 1)
Respuesta.
3(3m + 1)(3m - 1)