So you didn't necessarily have to do this, but it's nice to see that this comes out of the derivative properties that we talk about in other videos. And then finally, we have minus, and we use the power rule right over here. So bring the two out front and decrement the exponent. So it's going to be two. It's going to be two times x to the two minus one power, which is just one, which we could just write as two x. So just like that, we have been able to figure out the derivative of f. And you might say, well, what is this thing now? Well, now we have an expression that tells us the slope of the tangent line, or you could view it as the instantaneous rate of change with respect to x for any x value.