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