We're going to keep doing this all the way until we get the nth term. All the way until we get to the nth color we should say. So this is going to be yn squared minus 2ynmxn. You don't even have to think, you just have to substitute these with n's now. We could actually look at this, but it's going to be the exact same thing. mxn minus 2ynb plus m squared xn squared plus 2mxnb plus b squared. So once again, this is just the squared error of that line with n points, between those n points and the line y equals mx plus b.