So the only critical points would be where this derivative is equal to 0. So let's set this thing equal to 0. So we want to solve the equation, I'll just rewrite it actually. So we want to solve the equation g prime of x is equal to 0, or 2 plus f of x is equal to 0. You can subtract 2 from both sides, and you get f of x is equal to negative 2. So any x that satisfies f of x is equal to negative 2 is a point where the derivative of g is equal to 0. And let's see if f of x is equal to negative 2 at any point.