Q. Continue 2 power functions
that this is the two-valued function (the sign ± before the square root symbol says about this). Such functions are not studied in an elementary mathematics, therefore we consider usually as a function one of its branches: either an upper or a lower branch.

Explaination of the texty=±xFor one value of x>0 there are two values of y. So this is not a functionIn a function, one element of domain is exactly mapped with a unique element of co-domain. This definition is violated here.

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