Posted by Philip on Wednesday, September 12, 2012 at 7:25pm.
The domain of a function is the set of all possible input values, which allows the function formula to work.
In this case when x ^2 > 9 then x ^ 2 -9 < 0
Square root negative numbers are complex numbers.
So domain of your function :
x ¡ 2 > 9
x > + OR - 3
thats mean
x <= - 3 and x >= 3
Becouse numbers less of - 3:
-4,-5,-6...
numers larger of 3:
4,5,6...
DOMAIN:
x <= - 3 and x >= 3
OR
(-infinity,-3) U (3,infinity)
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