You're essentially going to get a version of that. The left-hand side, use the chain rule. You're going to get f prime of h of x, f prime of h of x times h prime of x, comes straight out of the chain rule, is equal to, is equal to the derivative of x, is just going to be equal to one. And then you divide both sides by f prime of h of x, and you get our original property there. So now with that out of the way, let's just actually apply this. So we want to evaluate h prime of 14. Or sorry, h prime of negative 14 is going to be equal to one over f prime of h of negative 14.