Question 782841
Consider two issues for domain:<P>
1.  The denominator isn't 0<P>
2.  What's under an even root (usually 2...i.e. square root) isn't negative.<P>
If this is {{{sqrt(23-x)}}} then 23-x >= 0 so -x >= -23 so x <= 23.<P>
The domain is all real numbers such that x<=23.