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2-7.

Determine the vertex of each of the following parabolas by averaging the -intercepts. Then write each function in graphing form.

  1.  

    What are the -intercepts of this equation? After finding them, average the -coordinates to find the -value, and then substitute this value into the equation to find the corresponding -value.

    -intercepts: and
    vertex:

    equation: 

  1.  

    Refer to part (a).

    -intercepts: and
    vertex:

    equation:  

  1.  

    Refer to part (a).

    -intercepts: and
    vertex:

    equation:  

  1.  

    First square and combine like terms.

    Refer to part (a).