Watch these videos and take notes. The first video shows an example of dividing a quadratic trinomial by a binomial. Note that the result can be checked by multiplication, just like as the result of the division of real numbers. The second video introduces the method of dividing polynomials known as long division. Sal Khan first tries out this method by dividing a simple binomial by a monomial, which you already know how to do. Then, he generalizes the procedure in order to divide a trinomial by a binomial. Note that he checks his result later by factoring, a procedure you will learn about in Unit 9. You will see more examples of long division in the next two Khan Academy videos as well. The third video shows an example of dividing a cubic four-term polynomial by a binomial. This time, the long division method produces a remainder.