Range Function is Incorrect

[garv-shah]

The range function doesn't seem to output the correct range, for example (x-1)^2 + 2 outputs all real numbers

[Decimation]

You're correct, I believe I wrote this function back in high school pre-calculus where I was taught that a function's range can be derived from the domain of its inverse. The range function implements this by returning domain(1/f,x) (last I checked)