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1. $3 x^{2} - x - 10$

Answer: Option A

Explanation:

3 x^{2} + x - 10 = 3 x^{2} + 6 x - 5 x - 10 = 3 x (x + 2) - 5 (x + 2) = (3 x - 5) (x + 2)

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