f(x) = x2 − 8x + 15
g(x) = x − 3
h(x) = f(x) ÷g(x)

h(x) =       x - 5   x^2 - 8x + 15   x - 3  . The domain of h(x) is       (3, 5)   (-infinity, 3)   (-infinity, -3)   U