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The simplest answer is that the domain is all non-negative real numbers and the range is the same. However, it is possible to define the domain as all real numbers and the range as the complex numbers. Or both of them as the set of complex numbers. Or the domain as perfect squares and the range as non-negative perfect cubes. Or domain = {4, pi} and range = {8, pi3/2} Essentially, you can define the domain as you like and the definition of the range will follow or, conversely, define the range and the domain definition will follow,
The domain is anything you want it to be. You could define the domain to be integer values only, or it could be {-3, -2.5, .2, 0, sqrt(7), 9}.
The co-domain or range.
it is called as co-domain