what is the expression 2x^3 - 4x^5 polynomial expressions

O monomial
O binomial
O trinomial
O 2 degree
O 3 degree
O 4 degree
O 5 degree

The expression 2x^3 - 4x^5 is a polynomial expression because it is a sum of multiple terms involving powers of x. It is a 5th degree polynomial because the highest power of x is 5.