All real numbers except 3.
Work Step by Step
The domain exists only when the denominator is not zero. Thus, we find: $$ x^2-6x+9=0\\ \left(x-3\right)^2=0 \\ x=3$$ Thus, the domain is all real numbers except 3.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.