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2(x²-9)
2((x+3)(x-3))
2x² - 18 = Sacamos factor común 2
2(x² - 9) = El paréntesis aplicamos diferencia de cuadrados
a² - b² =(a + b)(a - b)
2(x² - 3²) =
2(x + 3)(x - 3)
Respuesta.
2(x +3 )(x - 3)