Question

Find the Domain of 1/(x^2+1)

Answer 1

what are the three cases where the function would be undefined?

Answer 2

...where any function would be undefined

Answer 3

so is this an undefined function?

Answer 4

no, I don't think you are familiar with the terminology...
a function cannot be undefined as a whole, in can be undefined for certain x...

Answer 5

i really dont know the cases in which the function would be undefined
all i know is that you have to equal it to 0

Answer 6

careful what you mean when you say "it", for example the function\[y=\sqrt x\]is undefined for x<0

Answer 7

if you set your function equal to zero you will not get an answer, you must first ask yourself, "what are the potential problems here?"

Answer 8

for the function\[y=\sqrt x\]if x<0 then we are taking the square root of a negative number, so we have to watch out for square roots of negative number
the domain of y=sqrt(x) would be x>=0

Answer 9

notice that in this case x can be zero because it is okay \[\sqrt0\]is defined

Answer 10

we have no square roots in your problem, so what other things might you need to look for that are "not allowed" ?

Answer 11

this question is like this