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Caso.
Factor común.
9x²(x² - 1) - (x² - 1) = Sacas factor comun (x² - 1)
(x² - 1)(9x² - 1) = Aplicas diferencia de cuadrados
a² - b² = (a + b)(a - b)
(x² - 1²)(3²x² - 1²) =
(x + 1)(x - 1)(3x + 1)(3x - 1)
Respuesta.
(x + 1)(x - 1)(3x + 1)(3x - 1)