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1. $2 a^{2} + 6 a - 80$

Answer: Option D

Explanation:

2 a^{2} + 6 a - 80 = 2 (a^{2} + 3 a - 40) = 2 (a^{2} + 8 a - 5 a - 40) = 2 \{a (a + 8) - 5 (a + 8)\} = 2 (a + 8) (a - 5) ∴ নির্ণেয় উৎপাদক হলো (a + 8)

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