And so this thing is going to be defined for all x. So the only critical points we're going to have is when the first derivative right over here is equal to zero. So negative 3x squared plus 12x minus five needs to be equal to zero in order for x to be a critical point. So now we just have to solve for x. And so we just are essentially solving a quadratic equation just so that I don't have as many negatives. Let's multiply both sides by negative one. I just like to have a clean first coefficient.