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= 4a² + 6a + 6a + 9
= 4a² + 12a + 9
(2a + 3)³ = [(2a + 3) (2a + 3)] (2a + 3)
= (4a² + 6a + 6a + 9) (2a + 3)
= 8a³ + 12a² + 12a² + 18a + 12a² + 18a + 27
= 8a³ + 36a² + 36a + 27