Originally Posted by

**Paze** Hi MHF.

When giving an answer for a domain, say for: $\displaystyle f(x)=\sqrt{x}$

Do I say:

$\displaystyle D(f)=R | x \geq 0$

Well...Tex codes aren't cooperating..I'll try and write it:

D(f)=R|x is greater than or equal to 0

Or do I write:

D(f)=x is a part of R | x is greater than or equal to 0

Which method is correct?

Also, when I have multiple values where x is not defined, but these values do not lie on a range such as the case for: $\displaystyle f(x)=\frac{x}{x^2-1}$

How do I answer for -1 and 1? Do I write:

D(f)=R|x is not equal to -1, x is not equal to 1 ?

Thanks!