That's going to be m squared x1 squared plus 2 times mx1 times b plus b squared. All I did, if this was a plus b squared, this is a squared plus 2ab plus b squared. We're just going to do that for each of these terms, or each of these colors I guess you could say. Now let's move to the second term. Plus, it's going to be the same thing, but instead of y1s and x1s, it's going to be y2s and x2s. So it is y2 squared minus 2y2mx2 minus 2y2b plus m squared x2 squared plus 2 times mx2b plus b squared. We're going to keep doing this all the way until we get the nth term.