Ex: Determine the Domain of a Square Root Function

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This video provides an example of how to determine the domain of a square root function.

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I don't see the point in using the graph as a way to find the domain and range, if you don't also show how we get what the graph looks like, and since most test wont let you use a graphing calculator it just seems like a bad way to go about finding the D and R, like setting yourself up for failure...

jesterj