Let f(x) = 5/b+5 - 2/b . Find the domain and simplify.

Question

anonymous · Answer

you cannot have 
$$f(x)$$ on one side and an expression in b on the other.  is this 
$$f(x)=\frac{5}{x+5}-\frac{2}{x}$$?

anonymous · Answer

if so the implied domain is all  numbers except 
$$x=-5,x=0$$ because these would make the denominator 0,and you cannot divide by 0

anonymous · Answer

it has a b on the other side

$$f(x) = \frac{5}{b+5} - \frac{2}{b}$$

anonymous · Answer

then it makes no sense.  this is the second time i saw this exact same problem. i am wondering where it came from

anonymous · Answer

lol, this came from my math professor.  I had no idea how to do it either.

anonymous · Answer

tell your math professor (gently) that you think maybe there is a typo

anonymous · Answer

it is possible to write 
$$f(x)=c$$ meaning f is constant.  
answer above is still good.  b cannot be 0 or -5

anonymous · Answer

So the answer would actually be:

$$\left\{ x | x \in \mathbb{R} \ except\  x \neq -5\ or\ x \neq 0\right\}$$