is an expression which is neither monomial nor ________.
Explanation.
Monomial: A monomial is an expression that contains only one term.
Binomial: A binomial is a polynomial expression that contains exactly two terms.
Trinomial: A trinomial is an expression that is composed of exactly three terms.
The given expression , has three terms. Therefore, it is trinomial.
Hence, is an expression which is neither monomial nor binomial.