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Diferencia de cubos
a³ - b³ = (a - b)(a² + ab + b²)
(2a - b)³ - 27 =
(2a - b)³ - 3³ =
((2a - b) - 3)((2a- b)² + 3(2a - b) + 3²)
(2a - b - 3)((2a)² - 2(2a)(b) + b² + 6a - 3a + 9)
(2a - b - 3)(4a² - 4ab + b² + 6a - 3b + 9)
Respuesta.
(2a- b - 3)(4a² - 4ab + b² + 6a - 3b + 9)