SOLUTION: Find all numbers (rational expressions) where the solution is undefined: w-1 ----- = 9

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Question 281418: Find all numbers (rational expressions) where the solution is undefined:
w-1
----- =
9

Found 2 solutions by richwmiller, Mathematicians:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
expressions are undefined when the denominator =0
the denominator always = 9
the expression is never undefined.

Answer by Mathematicians(84) About Me  (Show Source):
You can put this solution on YOUR website!
This one is an easy case. You basically want to look for when the denominator is 0.
%28w-1%29%2F9
Since the denominator is 9, it can never be 0. Therefore it is never undefined.
However, if you had:
9%2Fw-1
we can make w+-+1+=+0
then you can see w+=+1
When w+=+1, we get the denominator is 0, thus being undefined.