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1. $x^{3} + h x + 10 = 0$

Answer: Option B

Explanation:

দেওয়া আছে, x = 2 x^{3} + h x + 10 = 0 \Rightarrow 2^{3} + h . 2 + 10 = 0 \Rightarrow 2 h + 18 = 0 \Rightarrow 2 h = - 18 \Rightarrow h = - 9

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