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2x² - 8 = Factorizas sacas factor comun 2
2(x² - 4) = Factorizas el parentesis es una diferencia de cuadrados
aplicas a² - b² = (a + b)8a - b)
2(x² - 2²)
2(x + 2)(x - 2)
Respuesta.
2(x + 2)(x - 2)