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Aplicas productos notaables.
(a - b)³ = a³ - 3a²b + 3ab² - b³
(1 - 3y)³ =
1³ - 3(1)²(3y) + 3(1)(3y)² - (3y)³ =
1 - 9y + 3(3²y²) - 3³y³ =
1 - 9y + 3(9y²) - 27y³ =
1 - 9y + 27y² - 27y³
Respuesta.
1 - 9y + 27y² - 27y³