Answer :

(i) 3x2-4x+15 is a polynomial of one variable x.

(ii) y2+2is a polynomial of one variable y.


(iii) 3+x is not a polynomial as the exponent of 3is not a positive integer.


(iv) x - is not a polynomial as the exponent of - is not a positive integer.


(v) x12+y3+t50 is a polynomial of three variables x, y, t.


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