-15x³ is cubic Polynomial or threedegree polynomial.
Polynomial is being categorized according to the number of terms and the degree present. Polynomial equations are the equation that contains monomial, binomial, trinomial and also the higher order polynomial. The form of a monomial is an expression is a(x^{n}) where n is a non-negative integer. The variable ‘a’ is called as the coefficient of (x^{n}) and n is the degree of the monomial. Based on the value, one term is called as monomial (when n = 1), two-degree polynomial (when n = 2) and three-degree polynomial (when n = 3).
