#### Answer

$$x: [-5,10] \\ y: [-40,0]$$

#### Work Step by Step

In order to find a good window for a graph, first plug the equation into your graphing calculator.
Next, go to the window, and change the viewing window until it gives a good image of the function. Be sure to include the minima and maxima in the window.
Doing this, we find that a good window is:
$$x: [-5,10] \\ y: [-40,0]$$