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= (2a + 3b)(9a² - 6ab + b²)
= 18a³ - 12a²b + 2ab² + 27a²b - 18ab² + 3b³
= 18a³ + 15a²b - 16ab² + 3b³
= 9a² + 3ab + 3ab + b²
= 9a² + 6ab + b²
( 2a + 3b ) ( 9a² + 6ab + b² ) = 18a³ + 27a²b + 12a²b + 18ab² + 2ab² + 3b³
= 18a³ + 39a²b + 20ab² + 3b³