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⇒ ( 3a² + 9a ) + ( 4a + 12 )
⇒ 3a ( a + 3 ) + 4 ( a + 3 )
⇒
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3a² + 16a - 12 ⇒ 3a² - 2a + 18a - 12
⇒ ( 3a² - 2a ) + ( 18a - 12 )
⇒ a ( 3a - 2 ) + 6 ( 3a - 2 )
⇒