SOLUTION: finding the numbers that are not in the domain of the function? f(x)=x/x-7 So i set x-7=0 so x=7 So therefore it can't be 7, it cant be domain so it would be {x|x#7} right?

Algebra ->  Functions -> SOLUTION: finding the numbers that are not in the domain of the function? f(x)=x/x-7 So i set x-7=0 so x=7 So therefore it can't be 7, it cant be domain so it would be {x|x#7} right?       Log On


   

Question 601031: finding the numbers that are not in the domain of the function?
f(x)=x/x-7
So i set x-7=0
so x=7
So therefore it can't be 7, it cant be domain so it would be
{x|x#7} right? but it keeps telling me i am wrong. what am i doing wrong??
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
You are correct in saying that the domain is

But I think they simply want the number (or numbers) that are not in the domain. Since you've shown that x = 7 causes a division by zero, this would mean that 7 is not in the domain.


So the answer is simply 7.