Answer with Explanation:

(Sq root of x -1/Sq root of x )2 = x + 1/x -2

 = (3 + 2 Sq root 2) + 1 / ( 3 + 2 Sq root 2) - 2
 
 = (3 + 2 Sq root 2) + 1/ (3 + 2 Sq root 2)x = (3 - 2 Sq root 2) / (3 - 2 Sq root 2)        -2 

 = (3 + 2 Sq root 2) + (3 - 2 Sq root 2) - 2

 = 4.

Therefore,(Sq root x - 1/ Sq root x) = 2.

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