Domain and range - functions and relations :D

Hello all!

We're currently learning about Functions and Relations. Here is a question im unsure about. Help would be greatly appreciated.

**Question: For the following function, state:**

**(i) the domain**

**(ii) the co-domain**

**(iii) the range**

**f : ( -¥ , 0 ) ® R , f (x) = 1/ Ö- x (one divided by square root of negative x)**

I'm more concerned about how to do the **range**... because the answer says that the range is: ( 0 , **¥ **). How do you know with those types of graphs ( sqaure root underneath ) what the range is?

Help would be greatly appreciated! Thank- you :D