Question 956844
{{{(n^2+13n+40)/(8n)=((n+5)(n+8))/(8n)}}}
The only problem encountered in the domain occurs when the denominator goes to zero since division by zero is undefined.
So the only value for {{{n}}} that is not allowed is {{{n=0}}}.
So the domain is ({{{-infinity}}},{{{0}}})U({{{0}}},{{{infinity}}}).