The biggest possible set is 
.
The question to ask yourself is: is the operation
<em>not valid for some values of x ? ("not valid" = impossible to compute)
</em>After removing all invalid values of <em>x </em>(if any), you have obtained the domain.<em>
</em>
The question to ask yourself is: is the operation
</em>After removing all invalid values of <em>x </em>(if any), you have obtained the domain.<em>
</em>