Was hoping someone could tell me or point me to a resource that could tell me about the image of a function. I've read and reread the definition in my book, but it's just not getting through at this time.

Question

anonymous · Answer

http://www.proofwiki.org/wiki/Definition:Image/Mapping/Mapping

anonymous · Answer

If there is an input $x$ such that $f(x)=y$, then $y$ is in the image of $f$.
The image is all possible $y$ when putting in every possible $x$.

anonymous · Answer

The image is always a subset of the co-domain.
It's sort of like the range, however "range" is an ambiguous term which can mean the image or the co-domain.

rsadhvika · Answer

image is all the values a function can spit out

rsadhvika · Answer

$y = x^2$

take above function, can -2478457485  be in its image ?

anonymous · Answer

Thanks for the help guys. Appreciate it.