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11-56.

Change each equation to graphing form. Sketch the graph and label each vertex and axis of symmetry.

  1.  

    Add to both sides to isolate the -terms.

    Factor out a from the -terms.

    Complete the square. Remember to add to both sides.

    Simplify.

    Where is the vertex? Axis of symmetry?

  1.  

    See part (a).