View more at http://www.MathTutorDVD.com. In this lesson, you will learn how to multiply binomials that contain radicals and simplify the result. Part of doing this is ensuring that the denominator of the result does not contain any radicals. You will learn how to rationalize the denominator of the answer, which just means that we multiply by the conjugate in order to remove any radicals from the denominator in the answer.