Answer:
Answer is given below with explanations.
Step-by-step explanation:
[tex] {a}^{2} + 2 a + 6a + 12 = 0 \\ a(a + 2) + 6(a + 2) = 0 \\ (a + 6)(a + 2) = 0 \\ a = - 6 \: \: \: \: \: (or) \: \: a = - 2[/tex]
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