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

8-68.

The * *of the graph of are

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

, theof the vertex is. 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.