\(x - \frac{1}{x} = \sqrt 5 \) হলে, \(x3 - \frac{1}{{x3}}\) = এর মান কত ?  

A \(4\sqrt 5 \) 

B \(6\sqrt 5 \) 

C \(8\sqrt 5 \) 

D \(9\sqrt 5 \) 

Solution

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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