Do you have a picture for this problem? There are multiple different ways to solve this problem but I'll need a picture to help you.
Answer: (c)
Step-by-step explanation:
Given

Here, 
To get
, replace
in
by 

Using
and
it can be concluded that the domain of
is all real numbers except 0.
Therefore, its domain is given by

Option (c) is correct.
Hi there,
It is 1 4/5. In decimal it is 1.8. Hope it helps:-)