The graph of the function f(x) = x2 8x 12 is shown. Which statements describe the graph? Check all that apply. The vertex is the maximum value. The axis of symmetry is x = –4. The domain is all real numbers. The range is all real numbers. The function is increasing over (–[infinity], –4). The x-intercepts are at (–6, 0) and (–2, 0).