If you come across any function in math that you want to graph, you could always make an x-y chart or table to plot some points and look for a pattern. However, it's important to think about domain restrictions- that is, are there any x-values that can not be put into the function. In the case of square roots, you will have domain restrictions because whatever is under the square root sign must be non-negative. This puts limits on the x-values that you can put into your table.
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