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They are called "like terms".
Alg.
Undefined terms are numbers that con't be determined, like 1/0. Not to be confused with irrational numbers, though.
A binomial has two terms, while a trinomial has 3 terms. So both terms of the binomial will multiply each term of the trinomial (distribution property). After the multiplication you'll have 6 terms. Look for like terms, if there are, combine them.
you need to know the pythag theorem , order of operstions combining like terms