A polynomial containing three unlike terms.


  • The expression 3x + y – 8 is a trinomial.
  • The expression \(a^{2} + 2ab + b^{2}\) is a trinomial.

Etymological note

The term trinominal is derived from the Greek prefix tri (τρι) meaning three, and from the Greek word nomos (νομοσ), meaning part, portion or division. Therefore, a trinomial is an algebraic expression with three entities, three parts or three elements.

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