Square trick

 Fig. 1

Let us consider
 x is any number , Then what is the solution of above image question.
This type of question, you solve easly with the help of  this formula :-

Fig. 2

i.e. x to the power, (you see Colourd zone) in fig. 2
Where,  n is the number of Square root
And x is any number like 2,3,4,5,6,7,8,9,.....etc.

Eg:-

from above concept 

Therefore. 

We have 

             Ans.

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