So it's negative 100x to the negative 100 minus 1, which is equal to negative 100x to the negative 101. Let's do one more. Let's say we had z of x. z of x is equal to x to the 2.571 power. And we are concerned with what is z prime of x. Well, once again, power rule simplifies our life. n is 2.571. So it's going to be 2.571 times x to the 2.571 minus 1 power.