Hello from MrBillDoesMath!
Answer: domain restriction: x <> 3, x <> -3
Discussion:
To determine the domain restriction focus on the denominator of the expression, It is x^2 - 9. The expression is valid for all x except where x^2 - 9 = 0 as we can't dive a quantity by 0.
x^2 - 9 = 0 =>
x^2 = 9 =>
x + 3, -3
Thank you,
MrB
