Question 757285
Assuming you mean

F(x)= (3x^2-6)/(x^2+2x)

then...


{{{
x^2+2x<>0
}}}

so that 
{{{x<>0}}}

or 

{{{x<>-2}}}

Domain:

(-oo,-2) U (-2,0) U (0, oo)