Let's take the derivative of both sides of this expression to figure out what the derivative with respect to x of h is. So we get derivative with respect to x of h of x is going to be equal to the derivative with respect to x of all of this business. So I could actually just rewrite it. 3 times f of x plus 2 times g of x. Now, this right over here, the derivative of the sum of two terms, that's going to be the same thing as the sum of the derivatives of each of the terms. So this is going to be the same thing as the derivative with respect to x of 3 times f of x plus the derivative with respect to x of 2 times g of x. Now, the derivative of a number, or I guess you could say a scaling factor, times a function.