Let f(x) = x + 8x + 5. a. If a is the leading coefficient and...

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Let f(x) = x² + 8x + 5. a. If a is the leading coefficient and (h, k) is the vertex of the graph of this function, fill in the values: a = h = k = Does this parabola open up or down? Let f(x) = x² + 8x + 5. a. If a is the leading coefficient and (h, k) is the vertex of the graph of this function, fill in the values: a = h = k = Does this parabola open up or down?