So pause this video and try to figure it out on your own. All right, now let's work through this together. So our original g of x is equal to the cube root of x, which is the same thing as x to the 1 3rd. So in step one, it looks like Robert's trying to find the first and second derivative. So the first derivative, we just do the power rule. So it'll be 1 3rd x to the decrement the exponent. So this is looking good.