It's going to be equal to a. I didn't want to do that magenta color. It's going to be equal to a times the derivative of f of x. a times the derivative of f of x. Let me do that in blue color. Of f of x. And the other way to denote the derivative of f of x is to just say that this is the same thing. This is equal to a times, this thing right over here is the exact same thing as f prime of x. Now, this might all look like really fancy notation, but I think if I gave you an example, it might make some sense.