for the equation f(x) = x"- 4x - 12, a) determine whether the graph of the given quadratic function opens up or down, b) Next question ind the vertex, c) find the axis of symmetry, d) find the x- and y-intercepts, and e) sketch the graph of the function. 20 a) Does the parabola f(x) = x2 - 4x - 12 open up or down? O opens up O opens down - to b) The vertex of the parabola f(x) = x - 4x - 12 is (Simplify your answer. Type an ordered pair.) c) The axis of symmetry is d) What are the x-intercept(s) of f(x) =x"-4x - 12 (if any)? Select the correct choice below and fill in any answer boxes within your choice. O A. (Use a comma to separate answers as needed.) O B. There are no intercepts. The y-intercept of f(x) =x -4x -12 is e) Use the graphing tool to graph the parabola. Click to enlarge graph