why is Y=(x+2)^3(x-1)^1/2 not a function?

why is Y=(x+2)^3(x-1)^1/2 not a function?
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Because of the exponent 1/2. If we put x=5, y=343√4 which can be 686 or -686, because there are two square roots of 4: 2 and -2. The mapping has to be x→y uniquely to be a function.

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