SOLUTION: 1. Find the domain of the expression (x^2 - 1)/x. Domain = {x | x cannot be 0}. 2. Find domain of the expression x/(x^2 + 9). The domain for question 2 does not exist over

Algebra ->  Functions -> SOLUTION: 1. Find the domain of the expression (x^2 - 1)/x. Domain = {x | x cannot be 0}. 2. Find domain of the expression x/(x^2 + 9). The domain for question 2 does not exist over      Log On


   

Question 1208403: 1. Find the domain of the expression (x^2 - 1)/x.
Domain = {x | x cannot be 0}.
2. Find domain of the expression x/(x^2 + 9).
The domain for question 2 does not exist over the real numbers. In later chapters, the idea of complex numbers is talked about. I say domain does not exist.
You say?
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
.

Your answer to (1) is correct.

Your answer to (2) is incorrect.


The correct answer to (2) is "the domain is the set of all real numbers",
or any other equivalent form to say it.


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Comment from student :   Are you saying that the answer to question 2 should be domain = (-infinity, infinity)?


My response :   Why do you ask again ?   Isn't my answer complete and clear?