Question 1186252
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To answer this question, a polynomial should be written in the standard polynomial form.


If the number of the terms is finite and if all indexes (degrees) at all the terms with x 
are positive integer numbers, then the function is polynomial. 


If there is at least one term with non-integer index/degree of x 
and with non-zero coefficient, then the function is not a polynomial.



This problem is of the kind "open your eyes widely".