SOLUTION: Identify the domain: f(x)=-2x/(x+1) The answer is All Reals Except -1 How do I get that answer?

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Question 937954: Identify the domain:
f(x)=-2x/(x+1)
The answer is All Reals Except -1
How do I get that answer?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
x = -1 makes the denominator zero.

For all other x, the numerator is not zero, and f(x) is defined.