If f(x) = (x - 3)/(-x - 4), then for what value of x is $f^{-1}(x)$ undefined?
We want the value that $f(x)$ cannot be. I claim this is $-1$, can you see why?
Hi Dudeman,
I can see why but not without a fair amount of effort.
Do you have a short cut method?
+600 
