BD Merit - Freelancing, BCS, Bank, Primary, Admission, NTRCA

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Answer: Option C

Explanation:

x y = 1 \Rightarrow x (k - 2 x) = 1 \Rightarrow k x - 2 x^{2} - 1 = 0 \Rightarrow 2 x^{2} - k x + 1 = 0 শর্তমতে, {(- k)}^{2} -4.2.1=0 k^{2} = 8 ∴ k = \pm 2 \sqrt{2}

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