So let's figure out where negative 12x plus 12 could be equal to zero. See, we could subtract 12 from both sides, and we get negative 12x squared is equal to negative 12. Divide both sides by negative 12, you get x squared is equal to one, or x could be equal to the plus or minus, or x could be equal to the plus or minus square root of one, which is, of course, just one. So the second derivative at plus or minus one is equal to zero. So either between plus or minus one or on either side of them, we are going to be, we could be concave upward or concave downward. So let's think about this. And to think about this, I'm gonna make a number line.