Then it just keeps increasing, gets more and more and more positive. So it does indeed look like at x equals negative two, we go from being concave downwards to concave upwards. Now a calculus-based justification is we could look at the second derivative and see where the second derivative crosses the x-axis. Because where the second derivative is negative, that means our slope is decreasing. We are concave downwards. And where the second derivative is positive, it means our first derivative is increasing. Our slope of our original function is increasing, and we are concave upwards.