To find the polynomial degree you have only to add the exponents of all of the different components of the polynomial. In your case, you would add 1 and 5 from 4ab5 to get 6, 1 and 1 from 2ab to get 2, and 4 and 3 from 3a4b3 to get 7. Since the degree of the third component is the highest, that is you're answer.
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seventh degree polynomial x3 times x4 = x7
A fourth degree polynomial.
The degree of a polynomial is the highest power of the variable.
a polynomial of degree...............is called a cubic polynomial
A polynomial of degree 0 is a polynomial without any variables, such as 9.