Consider the following equation. f(x) = x² + 2x - 1 (a) Find the vertex of the graph of the equation. (x, y) = (b) Determine whether the vertex is a maximum or minimum point. Omaximum O minimum (c) Determine what value of x gives the optimal value of the function. X = (d) Determine the optimal (maximum or minimum) value of the function. f(x) =

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