A perfect square trinomial is the result of multiplying a binomial times itself. The first term of the trinomial is the "a" term squared, the middle term represents the product of "2ab," and the last term is "b" squared. We use this relationship to fill in a middle term to create a perfect square trinomial. This skill is very important for what we call "completing the square," which is probably what you'll be learning next in class.
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