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The of the graph of are and .

  1. What is the of the vertex? How do you know?

    Consider that the vertex of a parabola is on the line of symmetry.

    Since the line of symmetry lies exactly in the middle of the two , the of the vertex is .

  2. Use your answer to part (a) above to find the of the vertex. Then write the vertex as a point .

    Substitute the you found for , and find the corresponding .