Get more lessons like this at http://www.MathTutorDVD.com In this lesson, we will learn what a perfect square trinomial is and how to factor perfect square trinomials. Perfect square trinomials are special because they can be factored immediately once you recognize their special form. We will also learn what the difference of two squares is and how to factor the difference of two squares. This occurs when two terms are squared and subtracted from one another. The factored form can be immediately written down without any further work once you understand the pattern to look for.