### Home > CAAC > Chapter 13 > Lesson 13.CS1-S > Problem 4-135

4-135.

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. 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

How many ones do you need to make a perfect square? How many do you have?

*f*(*x*) = (*x* + 3)^{2} +6

vertex: (−3, 6)

axis of symmetry: *x* = − 3

Write each of the expressions in its proper location.

*y* = (*x* + 2.5)^{2} − 8.25