Answer:
Trinomial.
Explanation:
When an algebraic expression has one term, we say that is monomial, because the prefix mono means one.
When it has two terms, we say that is binomial, because the prefix bi means two.
When it has three terms, we say that is trinomial, because the prefix tri means three.
When it has more than three terms, we just say that is x-term polynomial. For example, if it has six terms, we say that is six-term polynomial.
Therefore, according to this, the given expression is trinomial, because it has three terms.