And so if we're decreasing right to the left of zero, we're decreasing right to the right of zero, we're actually going to be decreasing at zero at, we're also going to be decreasing at zero as well. So there's something interesting here. Even though the derivative at x equals zero is going to be equal to zero, we are still decreasing there. And so the interval that we care about, the interval over which we're decreasing is just x is less than 5 1⁄2. And we can see that by graphing the function. I graphed it on Desmos. And you can see here that the function is decreasing from negative infinity, it's decreasing at a slower and slower rate, we get to zero, still decreasing to the left of zero, and then it continues to decrease to the right of zero.