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For the following quadratic function, (a) find the vertex and the line of symmetry, (b) state whether the parabola opens upward or downward, and (c) find its x-intercept(s), if they exist. f (x) = x- + 8x+7 a) The vertex of the parabola is (Type an ordered pair.) The line is the line of symmetry of the function f(x) =x- + 8x + 7. (Type an equation.) b) The parabola opens c) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The x-intercept(s) is/are (Type an ordered pair. Use a comma to separate answers as needed.) O B. The function has no x-intercepts