Manually Adjust Window Settings When Graphing
The window settings clearly do not effectively reveal the graph on the TINspire. The xvalues of the function represent the width of the rectangle, and the yvalues represent the area. The yvalues are positive. Therefore, it makes sense to focus on the first quadrant only.
To grab the entire coordinate plane, move the cursor to some open space and press [CTRL][CLICK]. You see the crunched up paper symbol with a hand, indicating that the entire coordinate plane can be translated in any direction. Use the Touchpad keys to move the graph so that the origin is located in the lowerleft corner of the screen. Press [ESC] to release the coordinate plane.
Unfortunately, the maximum point on the parabola is still not in view. TINspire allows you to grab the tick marks on the axes themselves to change these end values. Here’s how:

Move the cursor over the xaxis. Both axes start to pulse, and the word axes appears on the screen.
If another object (like text) gets in the way of finding the xaxis, press [TAB] to cycle through and find any layered objects.

Press [CTRL][CLICK] to grab both axes.

Press the Touchpad keys to drag the tick marks. Moving away from the origin zooms out. Moving toward the origin zooms in.

Press [ESC] when the vertex of the parabola comes into view.
Perhaps you want to adjust the scale of the xaxis only to completely fill the space in the work area with your graph. Follow these steps to do so:

Move the cursor over the xaxis. Again, both axes start to pulse, and the word axes appears on the screen.

Press [CTRL][CLICK] to grab both axes.

Press and hold [SHIFT] as you press the Touchpad keys to drag the tick marks, moving toward the origin to decrease the scale of only the xaxis and moving away from the origin to increase the scale of only the xaxis.

Press [ESC] to release the xaxis.
The last two screens show the result of dragging both axes and a single axis, respectively.
Here are two more options that can be used to adjust the window settings:

Move the cursor to an axis end value (assuming that it’s in view) and press [CLICK] twice to highlight the current end value. Type a new end value and press [ENTER] to put the change into effect. To edit all four end values one after the other, don’t press [ENTER] after changing an end value. Instead, press [TAB] to rotate in a clockwise manner to the next end value.

Press [MENU]→Window/Zoom→Window Settings. This action opens a dialog box and enables you to type your minimum and maximum end values as well as the scale. Press [ENTER] to put the changes into effect.