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Math Help - another inequality quadratic problem

  1. #1
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    another inequality quadratic problem

    another inequality quadratic problem
    Attached Thumbnails Attached Thumbnails another inequality quadratic problem-p61-q10-re.ex2-bk1.gif  
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  2. #2
    MHF Contributor red_dog's Avatar
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    You did a mistake.
    x^2-6x+8\geq 0\Rightarrow x\in(-\infty,2]\cup [4,\infty)
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