\(x - \frac{1}{x} = \sqrt 5 \) হলে, \(x3 - \frac{1}{{x3}}\) = এর মান কত ?
Correct Answer: Option C
(-) এর মান দেয়া আছে তাই \((\sqrt 5 )3 + 3.\sqrt 5\)
= \(\sqrt {5.(} \sqrt 5 )2 + 3\sqrt 5 \)
= \(5\sqrt 5 + 3\sqrt 5 = 8\sqrt 5 \)
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