QUOTE
f(x) = x²-3x
Omg... is this supposed to be a challenge?
x² is a basic hyperbole (spelling?), at least i'm thinking that's the word for it
It's been awhile since high school... but that's just small math.
-3x is just and offset that shifts the hyperbole.
Check if this function is a 1-1 function(That for 1 point in the x there is 1 in the y)1-1 relationship? For every x, there is one y. For every y, there is two x's, except for the lowest point.
I believe, by pure defination of a 'function', you can only have 1 y for every x. So unless you are talking about something else, the anwser is yes.
However, if, for some reason I'm wrong, I'd feel pretty salty. I'd blame it on coming home from work and not sleeping yet.