Answer:
The answer to this question is All real numbers greater than but not equal to 0
Step-by-step explanation: Because you need to find the domain by finding where the function is defined. So, the first thing you need to notice is that the square root of 9x is 3x, which means that it is a perfect square. So since 9x is a perfect square, which makes the square root 3x, the domain of the function is all real number greater than but not equal to 0