Answer:
[tex]y=\sqrt{x+12}[/tex]
Step-by-step explanation:
To find the inverse of a function, what I like to do is to switch the places of x and y, and then try to isolate y again like so:
[tex]x=y^2-12[/tex]
[tex]x+12=y^2[/tex]
[tex]y=\sqrt{x+12}[/tex]
Hope this helps!