I havent really been able to find a way to solve this. I have attempted everything I can think of.
Show the following function is one to one without invoking the horizontal line test.
f(x)= x^2-4x; x<2
P.S- obviously TW is not the place for math advice. Me and my friend have been trying to solve this for two hours. It is a bonus problem and our instructor said we cannot ask him how to do it as it is a bonus, otherwise that is what I would be doing.
Any help would be greatly appreciated!!