Chapter 5 - Exponents and Polynomials - 5.1 - Addition and Subtraction of Polynomials - Problem Set 5.1 - Page 194: 6

degree = 4

The degree of the polynomial is equal to the degree of the term with the highest degree. The terms of the polynomial have the following degrees: First: $=4$ Second: $=2$ Third: $=0$ Thus, the degree of the given polynomial is 4.