SOLUTION: find the domain of x sqrd/(x sqrd-9)

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Question 842839: find the domain of x sqrd/(x sqrd-9)
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use the caret to denote a power.
x^2=x%5E2
Look for values of x when the denominator equals zero since division by zero is undefined.
x%5E2-9=%28x%2B3%29%28x-3%29=0
Two solutions:
x%2B3=0
x=-3
and
x-3=0
x=3
So then the domain is all values except x=3 and x=-3
(-infinity,-3)U(-3,3)U(3,infinity)