What is the differance between a monomial binomial trinomial and a polynomial

and which is this equation 15x^4 - 6w^3 + 4w + 3y^5 - 4

monomial is 1 term

binomial is 2 terms

trinomial is 3 terms

polynomial is 4+ terms

That is a polynomial (5 terms)

A polynomial can have fewer than 4 terms; x^2 is a polynomial.

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The difference between one, two, three, and some.

A polynomial has one or more terms. Those other words denote special kinds of polynomials, with one, two, or three terms, respectively.

Your example is just a polynomial.