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10a^2 + 30a + 24= 0
5a^2 + 6a + 12 = 0
2. 9a^2 + 12a + 4 - 6a^2 + 8a + 2 = 0
3a^2 + 20a + 6= 0
= 9a² + 12a + 4 - 6a² - 8a - 2
= 9a² - 6a² + 12a - 8a + 4 -2
= 3a² + 4a + 2
(3a+5)(2a+4) + (2a+2)²
= (6a² + 28a + 20) + (4a² + 8a +4)
= 6a² + 4a² + 28a + 8a + 20 + 4
= 10a² + 36a + 24