The second derivative is going to be square root of 3 over 18 plus 1 over 8. So this thing right over here is greater than 0, which means we're concave upward for all x's. Which means for all x's, we're kind of doing a situation like this. So if we find an x where the slope is 0, it's going to be over an interval where it's concave upwards. This is concave upwards for all x. So we're going to be at a minimum point. The slope is 0 right over here.