Yes, it cannot contain any imaginary numbers
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The answer provided by the community is just plain wrong. Polynomials can have complex numbers or even matrices.
the domain is all real numbers and the range is all real numbers the domain is all real numbers and the range is all real numbers
The domain is all real numbers, and the range is nonnegative real numbers (y ≥ 0).
It could be either depending on the function that you have.
All real numbers. Or all complex numbers, if you are working with complex numbers.
Since it is a polynomial we know right away the domain is all real numbers.