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12-51.

Solve the following quadratic equations by completing the square, if possible. Leave your answers in exact form. Check your solution(s).  

  1.  

    Add to both sides.

    Simplify.

    Write two equations.

    or

  1.  

    Add to both sides.

    Follow the steps in part (a).

  1.  

    Follow the steps in part (b).

    or

  1.  

    Follow the steps in part (a).