So the inside function's derivative, the derivative of two x is two, derivative of negative five is zero, so it's gonna be times two. And of course you can simplify it, so it's negative two times all of this business. Let me do one more example here, just to hit the point home. And once again, there isn't a must way, there isn't a way that you have to do this, but just let you appreciate that there's multiple ways to approach these types of derivatives. So let's say someone said, take the derivative of two x plus one squared. Pause the video and think about how you would do that. Well one way to do it is just to apply the chain rule just like we just did.