Get more lessons like this at http://www.MathTutorDVD.com In this lesson, you will learn what a common factor is in a polynomial expression in Algebra. We will then use the concept of a common factor to pull out, or factor, the greatest common factor (GCF) from a multi term expression (polynomial). This is a crucial skill because factoring the greatest common factor in algebra is necessary to solve equations and inequalities for more complex topic in algebra 1, algebra 2, and college algebra.