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My teacher has told me the square root function is a valid function. He has also told me that a function cannot possibly have two different output for one given input. 36^1/2 for instance has both -6 and +6 as answers. He told me to just refer to the positive square root...eh, that seems kind of sloppy to just ignore half of the answers out of convenience, no?

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# How is f(x)=sqrt(x) a valid function?

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