View more at https://www.MathTutorDVD.com. In this lesson, you will learn how to factor trinomials and quadratic polynomials in algebra. We explain the method as the reverse of the FOIL multiplication method. You will learn how to examine each term and determine what can be multiplied together to get that term in each part of the expression. Finally, we must choose the correct signs in order to make the inside and last terms add correctly. You will learn how to factor polynomials (trinomials and binomials) in algebra by solving problems step-by-step.