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No, it is not. -√(-5) can be written many ways -5i is the most common, but once you get into complex numbers, functions change. -5i5 is also valid, -5i9 is also, and so on. There must be a limit on complex functions, since they do not behave the same as real functions. ■

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14y ago
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Q: Is The negative square root of x minus five a function?
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