This 3 and minus 3 cancel out. So the change in x actually end up becoming this delta x, which makes sense, because this delta x is essentially how much more this guy is than that guy. So that should be the change in x, delta x. So the slope of my secant line has simplified to 6 times my change in x plus my change in x squared, all of that over my change in x. Now we can simplify this even more. Let's divide the numerator and the denominator by our change in x. And I will switch colors just to ease the monotony.