Final answer:
The domain of the function f(x) is all real numbers greater than or equal to 0, and the range is all non-negative real numbers.
Step-by-step explanation:
The domain of the function f(x) is the set of all real numbers greater than or equal to 0, since the function is defined as x for x≥0. The range of the function f(x) is the set of all non-negative real numbers, since the function is defined as x² for x≥0.