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. So if I were to say, if I were now to say f prime, let's say f prime of two, this would tell me what is the slope of the tangent line of our function when x is equal to two. And I do that by using this expression. So this is going to be five times two to the fourth plus six times two squared, six times two squared, minus two times two, minus two times two.