That's going to be 9. I'm just FOILing this out, or you do the distributive property twice. If a plus b squared is a squared plus 2ab plus b squared, so it's going to be 9 plus 2 times the product of these things. So plus 6 delta x, and then plus delta x squared. Plus delta x plus delta x squared. That's the coordinate of the second line. This looks complicated, but I just took this x value and I squared it, because it's on the line y is equal to x squared.