What is a trinomial(as opposed to binomials and mononomials)?

Question

bobpursley · Answer

http://en.wikipedia.org/wiki/Trinomial

Squid · Answer

I think I get it now!

Reiny · Answer

trinomial vs binomial vs monomial

how many wheels does a tricycle have?
how many wheels does a bicycle have?
how many wheels does a monocycle have?

how many terms does a trinomial have?
how many terms does a binomial have?
how many terms does a monomial have?