For the given functions f and g, find the requested function and state its domain. f(x) = x - 9; g(x) = 9x2 Find f + g. (f + g) (x) = 9x2+ x - 9; (-00, 0) (f + g)(x) = 9x2 - x+9; (-00, 0.) (f + g)(x) = -9x2+ x - 9; (-00, co) (f + g) (x) = 9x2+ x- 9; (-0, 9) u (9, 0.)