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1. $x^{2} + 7 x + a$

Answer: Option A

Explanation:

f (x) = x^{2} + 7 x + a রাশিটি (x - 5) দ্বারা বিভাজ্য হলে, f (5) = 0 হবে \Rightarrow 5^{2} + 7.5 + a = 0 \Rightarrow 25 + 35 + a = 0 ∴ a = - 60

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