SOLUTION: Rational functions find the domain of the rational function f(x)=x^2+x-12/x^2-9

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Question 1152492: Rational functions find the domain of the rational function f(x)=x^2+x-12/x^2-9
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!
f%28x%29=%28x%5E2%2Bx-12%29%2F%28x%5E2-9%29
f%28x%29=%28%28x+%2B+4%29+%28x+-+3%29%29%2F%28%28x-3%29%28x%2B3%29%29
The domain of a rational function consists of all the real numbers x+except those for which the denominator is 0 .
so,%28x-3%29%28x%2B3%29=0 if x=3 and x=-3
both values are excluded from a domain
domain is:
{ x element R+: x%3C%3E-3 and x%3C%3E3 }