Question 854726
Restirctions in the domain are numbers that make the denominator equal to zero since division by zero is undefined.
{{{x^2-13x+40=(x-5)(x-8)}}}
Two solutions:
{{{x-5=0}}}
{{{x=5}}} 
and
{{{x-8=0}}}
{{{x=8}}}
.
.
{{{graph(300,300,-2,10,-6,6,(x+1)/(x^2-13x+40))}}}