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


The roots (-intercepts) of are and .

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

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

The coordinate of the vertex is halfway between and .

Substitute the vertex value of back into the original equation to find .

Solve for .