Answer:
The domain of a is x does not equal 3 or -3
Step-by-step explanation:
In order to solve this equation, we need to set the denominator equal to 0, which we know it cannot be, and solve to see which x should not be in the domain.
1 - e^(9 - x^2) = 0
1 = e^(9 - x^2)
ln1 = lne^(9 - x^2)
0 = 9 - x^2
x^2 = 9
x = 3 or -3
