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