It is the sum of all the powers of each of the variables in the term. Remember, though, that the power 1 is implicit and usually not written.
For example:
x2y3 has degree 2+3 = 5
x2y has degree 2+1 = 3 because the term is actually x2y1
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Degree = 3 # terms = 3
The degree of the polynomial.
The degree of a polynomial is equal to the highest degree of its terms. In the case that there is no exponent, the degree is 1. If there is no variable, the degree is 0.
the degree of polynomial is determined by the highest exponent its variable has.
Assuming you mean a fourth degree polynomial,P4 = x4 + 1P3 = x3 + 1P4*P3 = x7 + x4 + x3 + 1 is a seventh degree polynomial.