Question:`x^2 + 1/x^2 = 18` হলে `(x + 1/x)` = কত? 

A `sqrt(5)` 
B `2sqrt(5)` 
C `3sqrt(5)` 
D `4sqrt(5)` 

+ Answer
B 

+ Explanation
`x^2 + 1/x^2 = 18`

   বা, `(x + 1/x)^2 - 2.x.1/x = 18`

   বা, `(x + 1/x)^2 = 18 + 2`

   বা, `(x + 1/x)^2 = (2sqrt(5))`

   :.` x + 1/x = 2sqrt(5)`

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