... Factorización - Productos notables Es una diferencia de cuadrados Forma general x^2 - y^2 = (x - y) (x + y) Para que entiendas tu ejemplo sustituyamos 1 = 1^2 = x^2 (a-3b)^2 = y^2 Desarrollemos de acuerdo a la forma general (1 - (a-3b)) (1 + (a-3b)) Se pueden eliminar paréntesis interiores (1 - a + 3b) (1 + a - 3b) Saludos.
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