SOLUTION: why can't substitute 3 for x in the rational expression 2/x-3?

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Question 325268: why can't substitute 3 for x in the rational expression 2/x-3?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
If you plug in x=3, you get 2%2F%283-3%29=2%2F0 but you CANNOT divide by zero. So this is why you CANNOT plug in x=3. We say that x=3 is not in the domain of 2%2F%28x-3%29 (ie it's not an allowable input).