SOLUTION: I need to know how to state the excluded values for this radical expression; 2a-10 ------ a squared -9

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Question 314948: I need to know how to state the excluded values for this radical expression;
2a-10
------
a squared -9
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Radical or rational?
Because I don't see a radical.
.
.
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%282a-10%29%2F%28a%5E2-9%29=%282%28a-5%29%29%2F%28%28a-3%29%28a%2B3%29%29
a=3 and a=-3 are not allowed since division by zero is undefined.