Answer:
(-infinity, -11) U (-11, 9) U (9, infinity)
Explanation:
we have to restrict this so that the denominator isn't 0
to find this, we can factor the denominator to (x+11)(x-9). the zeroes, then, are x=-11 and x=9.
so, the domain must exclude these values, and we get (-infinity, -11) U (-11, 9) U (9, infinity)