That's equal to 36 times 1 squared, which is just 36, minus 24 times 1. So it's 36 minus 24, so it's equal to 12. So this is positive. Our second derivative is positive here. It's equal to 12, which means our first derivative, our slope, is increasing. The rate of change of our slope is positive here. So at this point, right here, we are concave upwards.