But this is actually going to be equal to the derivative of a constant times an expression is equal to the same thing as the constant times the derivative of the expression. So this would have been the correct way to go. And then the derivative of x with respect to x, well, that's just going to be one. So this should have all simplified to eight. What she did is, she is assumed, she tried to take the derivative of eight and multiply that times the derivative of x. That is not the way it works. In the future, you will learn something called the product rule.