How do I know what to set my window variables when finding the zeros of a quadratic on a TI-83?

For example,-x ^ 2 70 x-825. What would set the window of X and Y variables, and why? I know that the graphics process to obtain the roots of a quadratic equation, but I have great difficulty deciding variable on which window to put in so I can get a clear picture of it. (I use the TI-83 +)

Usually with a feature like [Zoom]> 0: ZoomFit helps you to adjust the size of the window of appropriate size. With the previous equation in Y1, making ZoomFit one part of the function. Obviously it is more Xmax = 10. So, just play. I chose Xmax = 100. Now we see that we can see both sides of the dish. However, I still like to see some of the top. Going back to [Window] I change the value Ymax to a higher value. Let's say 500. Perfect. The roots can be easily found today.

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