Which of the following statements are true about the graph of f(x) = 6(x + 1)2 -9? check all of the boxes that apply. a-*the vertex is (1, -9). b-*the graph opens upward. c-*the graph is obtained by shifting the graph of f(x) = 6(x + 1)2 up 9 units. d-*the graph is steeper than the graph of f(x) = x2. e*the graph is the same as the graph of f(x) = 6x2 + 12x - 3.