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7-9.

Consider the function . Homework Help ✎

  1. Complete the square to find the vertex.

    Add and subtract   on the same side of the equal sign.

    Simplify.

    Simplify more.

  2. Find the y-intercept.

    Substitute to find the y-intercept.

  3. Use the vertex, the y-intercept, and the symmetry of parabolas to find a third point and sketch the graph.