The calculate feature of the calculator allows us to find a maximum or minimum value of a function. To do that, we will start by pressing second and then calculate. That particular function has a maximum value. So choose option 4. I'm asked to arrow to the left side of the graph. So, I need to arrow to the left of that maximum value. Just so my cursor is anywhere on the left. Enter. Now I need to be on the right of that maximum value. Enter Take a guess. So it's somewhere close to this. Enter This is telling me that the maximum value of the function is 5 and that occurs when X is 3 and a little bit more. I happen to know that this is calculator round off error and this occurs occasionally. The coordinates of the maximum value are actually 3 and 5 not this number that appears and we have to be aware of that. So the maximum value of the function is 5 and that happens when X is 3.