Answer:
The domain is (-infinity, -3) ∪ (-3, 3) ∪ (3, infinity)
Explanation:
This function is defined for all t such that the denominatory t^2 - 9 is not zero (0). Purposely setting t^2 - 9 = 0, we find that t = 3 or t = -3.
This function defined everywhere except at {-3, 3}.
The domain is (-infinity, -3) ∪ (-3, 3) ∪ (3, infinity)