Question 337937
The denominator of a fraction can never equal zero. This is the key to defining the domain. So {{{x^2-36=0}}} is never in the domain.  Solve this and you will find the two numbers that are not in the domain.  All others are.
{{{x^2=36}}}
x=6,x=-6
Therefore, the domain is all real numbers except 6 and -6.