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x^2-6x-7=0 Completing the square

need help

  • math -

    what is half of -6 squared: 6/2=3, squared , 9

    x^2-6x+9 -7=9
    (x-3)^2 =16
    take the square root of each side.
    x-3= +-4
    x=7, or -1

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