We can write a g of x to the 1 half. And this is just going to be equal to, let me write it right over here, it's going to be equal to 1 half times all of this business to the negative 1 half power. So 3x squared minus x, which is exactly what we need to solve right over here. f prime of g of x is equal to this. So this part right over here, I will, let me square it off in green. What we're trying to solve right over here, f prime of g of x, we have just figured out, is exactly this thing right over here. It's the derivative of f of the outer function with respect to the inner function.