First, clarifying that people need to "resist every temptation on earth" when squaring a binomial, Sal walks viewers through a few binomial equations using binomials and applies the skills from the previous videos about working with...

The teacher uses the FOIL method to multiply out the square of a sum to prove the equation.

The teacher uses the FOIL method to multiply out the square of a difference to prove the equation.

Video explains how to find special binomial products. Four examples are worked that show how to square a binomial. Three examples are worked that show the product of a sum and a difference (a +b)(a - b).