You can square any real number (complex ones too) so the domain is all real numbers.
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domain = set R ,, all real numbers
The answer depends on the domain for x. For example, if the domain is x = 7, then the range is 55. If the domain is all Real numbers, then the range is y >= 6.
all real numbers
The graph is a circle with a radius of 6, centered at the origin
If I understand the question correctly, the answer is not in real numbers. But in the complex domain, there is the imaginary number i is such that i2 = -1. And so, for any positive x, [i*sqrt(x)]2 = i2*x = -1*x = -x, which is negative.