OK. Instead of trying to find a quick, slick, easy, short way, let's just do it the long, sensible way. We'll find the value of each function at x=-2 and at x=-4, then see which one changed the most and which one changed the least.
g(x) . . . (table) when x=-2 . . . g(x) = 0 when x=-4 . . . g(x) = -8 Amount of change . . . 8