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1. $a^{2} - a - 56$

Answer: Option B

Explanation:

a^{2} - a - 56 = 0 \Rightarrow a^{2} - 8 a + 7 a - 56 = 0 \Rightarrow a (a - 8) + 7 (a - 8) = 0 \Rightarrow (a - 8) + (a + 7) = 0 a = 8, - 7

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