(3a + 9) (-2a + 3)
= 3a(-2a + 3) + 9(-2a + 3)
= -6a² + 9a - 18a + 27
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(3a + 9) (-2a + 3)
= 3a(-2a + 3) + 9(-2a + 3)
= -6a² + 9a - 18a + 27
= -6a² - 9a + 27