What Is a Perfect Square Trinomial?

A perfect square trinomial is the expanded product of two identical binomials. A perfect square trinomial is also the result that occurs when a binomial is squared. There are two general formulas for factoring a perfect square trinomial: x^2 + 2xy + y^2 = (x + y)^2, and x^2 - 2xy + y2 = (x - y)^2.

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