## anonymous 5 years ago What is the domain of 1/ x-1 + 1/x+1??

1. myininaya

$\frac{1}\frac{x-1}+\frac{1}\frac{x+1}$

2. myininaya

$\frac{1}{x-1}+\frac{1}{x+1}$

3. anonymous

Yes. ^^

4. myininaya

look at the first fraction when is that undefined

5. anonymous

When x is -1?

6. myininaya

the first fraction is undefined when x=1 the second fraction is undefined when x=-1 the domain is all real numbers but x=1 and x=-1 interval notation: (-inf,-1)U(-1,1)U(1,inf)