What is true about the function h(x) = x2 20x – 17? check all that apply. the vertex of h is (–10, –117). the vertex form of the function is h(x) = (x 20)2 – 17. the maximum value of the function is –17. to graph the function h, shift the graph of f(x) = x2 left 10 units and down 117 units. the axis of symmetry of function h is x = 20.