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Math Help - Need help with few exercises. Please help!

  1. #1
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    Need help with few exercises. Please help!

    √x2 + 1 + √x2 2x + 3 = 3

    │ x-4 │ - │ 20,5x│ ≤ 3

    │5- x2-6 │= x2-5x-6

    x2-2x+3 : x2-4x+3 > -2


    I'm so fail at math soo..would someone please help me ?
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  2. #2
    Super Member Showcase_22's Avatar
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    For the first one, do you mean \sqrt{x^2}?

    │ x-4 │ - │ 2–0,5x│ ≤ 3
    You need to get rid of the mods here. You can get rid of it by establishing case analysis.

    x-4-(2-0.5x) \leq 3
    4-x-(2-0.5x) \leq 3
    x-4-(0.5x-2) \leq 3
    4-x-(0.5x-2) \leq 3

    The other one can be done in a similar way.
    Last edited by mr fantastic; May 26th 2009 at 02:53 AM.
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