Now when we approach the limit from the right,
And the function is undefined.
(Radical is a negative number!)
So the limit (the regular limit) does not exist.
However, the one-handed limit, might. We already shown that the right-handed does not exists. Let us see the left-handed.
When we approach the limit from the left,
on some open interval where (a really small number). Because we do not care what happens far away one what happens really close to the point.
In that case,
Thus, the radical is defined.
And furthermore we can factor,