Question 407687
f(x)/g(x) = ((x+2)/(x-4))/((x^2+6)/(1))
f(x)/g(x) = ((x+2)/(x-4))*(1)/(x^2+6)
          =  ((x+2)*(1))/((x-4)*(x^2+6))

a point is not in the domain if (x-4)*(x^2+6) = 0.
This is because dividing by 0 is undefined.
x^2+6 > 0 for each x. If x = 4 then (4-4)*(x^2+6) = 0
so the domain is every x except x = 4