Plus n choose 2 x to the n minus 2. This is delta x squared, but when we divide by delta x, we just get a delta x here. And then we keep having a bunch of terms. We're going to divide all of them by delta x, right? And then the last term is delta x to the n. But now we're going to divide that by delta x. So the last term becomes n choose n. x to the 0 is 1, so we can ignore that. Delta x to the n divided by delta x.