Question: Suppose I define a black box with input a positive number x and output the positive and negative square roots of x . For example,

Suppose I define a "black box" with input a positive number x and output the positive and negative square roots of x. For example, the machine receives 4 and "spits out" 2 and -2. Is this a function? If Yes, why? If No, what went wrong?
Suppose I define a "black box" with input a

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