We want to find the domain of this function, so we have to remember that we can never have zero in the denominator. So I'm going to say the denominator can't equal 0, and I add five to each side. I'm going to divide by 9. So X cannot equal 5 ninths. It can be anything other than five ninths. So negative Infinity to five ninths with a parenthesis on both sides. Union 5 ninths to Infinity.