The quadratic function f(x) = a(x − h)2 + k is in standard form. (a) The graph of f is a parabola with vertex (x, y) =    (b) If a > 0, the graph of f opens ( upward or downward) ?. In this case f(h) = k is the( minimum or maximum )value of f ? (c) If a < 0, the graph of f opens ( upward or downward) ? . In this case f(h) = k is the ( mini

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