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why are the domain and range of square root function restricted to [0,?) ?

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Basic Math

why are the domain and range of square root function restrictedto [0,?) ?

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Square root of negative numbers are complex numbers ,so there is no real root for negitive real numbers .square root of zero is zero and the square root of positive real numbers are real so the domain of square root is greater than or equal to 0. Therefore square root function domain= [0,?)
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