How to find the roots of third or more than third degree polynomials?

Degree of the zero polynomial is

Define degree of a polynomial.

Find the degree of the polynomial 21

Find the degree of the polynomial 5x-7

Find the length of the third side of the triangle.

Find the length of the third side of the triangle.

If the degree of a polynomial AB is 15 and the degree of polynomial A is 5, then find the degree of polynomial B.

Find the degree of the following polynomials 23

Find the degree of the following polynomials 44a