Khan Academy
Example 2: Finding the Square of a Binomial with One Variable, Algebra I
Sal demonstrates what not to do when simplifying a squared binomial. Next, he clarifies why they can't square each term individually and then add them. He uses his incorrect example as a starting point to demonstrate how to simplify a...
Khan Academy
Example 1: Multiplying a Binomial by a Binomial, Algebra I
There are particular ways to multiply binomials. One could use the FOIL method or employ the distributive property. Sal walks through each step of the FOIL method and then shows that using distribution results in the same answer. This is...