I get the answer which is f-1(x) = (-1/9(x+2)^2) + 1 but the solution guide says:

" f-1(x) = (-1/9(x+2)^2) + 1 x >/= 2 OR f-1(x) = (-1/9(x+2)^2) + 1 [-2, infinty["

How do I get such restrictions? This seems to be false when checked with my graphing software but I could be wrong.

Any help would be greatly appreciated!

Thanks in advance!