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 Description  
 Trinomial:  An algebraic expression with three unlike terms.

Examples of Trinomials:

  • 3 + t + r2
  • a - 8b + c
  • 5 - u9 - 3v

Nonexamples of Trinomials:

  • 3 + 4 + x is not a trinomial since 3 + 4 can be combined into 7. So 3 + 4 + x = 7 + x, which is a binomial.
  • 5x2 + 8 is a binomial.
  • 3rst is a monomial.