| The domain is anything (legitimate) you define it to be, and the range can then be deduced. For example, if you choose the domain {0} for the first function, then the range would be {2}. If instead the domain were {0, 1, 2, 3} then the range would become {2, 5, 8, 11}. If the domain is R then so is the range. But the question "Find the domain" really doesn't make sense. I think you want us to find the greatest possible domain for f to be a real -> real function. |