The antiderivative of 16x to the negative three. We're just going to do the power rule for derivatives in reverse. You could view this as the power rule of integration or power rule of taking the antiderivative where what you do is you're going to increase our exponent by one. So you're going to go from negative three to negative two. And then you're going to divide by that amount, by negative two. So it's going to be 16 divided by negative two times x to the negative two. All I did is I increased the exponent and I divided by that amount.