We only need to worry about the values that make the denominator = 0 ..so we have
x^2 + 6x + 8 = 0 factor
(x + 4) (x + 2) = 0
And setting each factor to ), we see that X = -4 and x = -2 make the denominator 0....so the domain is....all x's except -4 and -2
