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Home > AC > Chapter 8 > Lesson 8.2.3 > Problem 8-68


The -intercepts of the graph of are and .  

  1. What is the -coordinate 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 -coordinate of the vertex. Then write the vertex as a point .

    Substitute the -value you found for , and find the corresponding -value.