### Home > CCA > Chapter 8 > Lesson 8.2.5 > Problem 8-106

For each quadratic function below, use the idea of completing the square to write it in graphing form. Then state the vertex of each parabola.

*8-106 HW eTool*(CPM). Homework Help ✎*f*(*x*) =*x*^{2}+ 6*x*+ 15*y*=*x*^{2}− 4*x*+ 9*f*(*x*) =*x*^{2}+ 8*x**y*=*x*^{2}+ 5*x*− 2

Set up tiles to reflect the problem.

Write an equivalent equation using the tile arrangement.

*f*(*x*) = (*x* + 3)^{2} + 6, vertex at (−3, 6)

Refer to part (a.)

You will need to add and subtract the same number of tiles on the right side of the equation in order to complete a square.

You will need to add and subtract the same number of tiles on the right side of the equation in order to complete a square.

Use the eTool below to help complete these problems.

Click the link at right for the full version of the eTool: CCA 8-106 HW eTool