\(x - \frac{1}{x} = 2\) হলে \(x3 - \frac{1}{{x3}}\) এর মান কত ?  

A

B 14 

C 28 

D 32 

Solution

Correct Answer: Option B

\(x3 - \frac{1}{{x3}} = (x - \frac{1}{x})3 + 3x.\frac{1}{x}(x - \frac{1}{x})\) = 2 + 3. 2 = 8 + 6 

যেহেতু (-) এর মান দেয়া আছে 2, তাই সরাসরি 2+ 3.2 = 8 + 6 = 14  

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