You can
put this solution on YOUR website!Domain means the set of all permissible x values. This means essentially, avoid making denominators zero and avoid allowing negatives in square roots, fourth roots, etc. In your case, the denominator cannot be zero, so x cannot equal 3. The domain is the set of all real numbers except 3.
For additional explanation, please see my website by clicking on my tutor name "rapaljer" anywhere in algebra.com. Then go to "Math in Living Color", look for "College Algebra", Chapter 2, Section 2.07. I have a detailed explanation there that might help! And, it's in LIVING COLOR!!
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