SOLUTION: Find all numbers that must be excluded from the domain of the rational expression. x-9 / x^2+4x-45

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Question 770155: Find all numbers that must be excluded from the domain of the rational expression.
x-9 / x^2+4x-45
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Use of grouping symbols is important. Do you mean, (x-9) / (x^2+4x-45) ?

The denominator is (x-5)(x+9) so it must not be allowed to be zero. This means x%3C%3E5, and x%3C%3E-9.