Question

El resultado de desarrollar (2a–3b2)3 es:

Answer 1

Aplicas productos notables.
(a - b)³ =
a³ - 3a²b + 3ab² - b³

(2a - 3b²)³ =
(2a)³ - 3(2a)²(3b²) + 3(2a)(3b²)² - (3b²)³ =
2³a³ - 3(2²a²)(3b²) + 6a(3²b⁴) - 3³b⁶ =
8a³  - 3(4a²)(3b²) +  6a(9b⁴) - 27b⁶ =
8a³ - 36a²b² + 54ab⁴ - 27b⁶

Respuesta.
8a³ - 36a²b² + 54ab⁴ - 27b⁶