I am thinking of something like $f(x) = 8$
Does this make sense? It seems a bit simple to me so I'm not sure.
My reasoning is that this function is not one-to-one because f takes same value for all domain.
It's also not onto because range isn't equal to codomain since here the range is just the number 8.
Thanks!
Best Answer
This is a fine example. Few functions are one-to-one or onto, so finding one that is neither should not be hard. You have succeeded. The point is to understand the definitions and you seem to have done that.