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Summer Clouds moderators

03/11/2017 at 08:58
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2
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Solve the inequation \(\left|2x-1\right|>x+3\).




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    Phan Thanh Tinh Coordinator 03/11/2017 at 11:27

    There are 2 cases :

    + \(2x-1\ge0\Leftrightarrow x\ge\dfrac{1}{2}\)

    \(2x-1>x+3\Leftrightarrow2x-x>3+1\Leftrightarrow x>4\)

    + \(2x-1< 0\Leftrightarrow x< \dfrac{1}{2}\)

    \(1-2x< x+3\Leftrightarrow1-3< x+2x\Leftrightarrow3x>-2\Leftrightarrow x>-\dfrac{2}{3}\)

    So, \(x>4\) or \(-\dfrac{2}{3}< x< \dfrac{1}{2}\)

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    Phạm Tuấn Đạt 04/11/2017 at 23:38

    + 2x−1≥0⇔x≥122x−1≥0⇔x≥12

    2x−1>x+3⇔2x−x>3+1⇔x>42x−1>x+3⇔2x−x>3+1⇔x>4

    + 2x−1<0⇔x<122x−1<0⇔x<12

    1−2x<x+3⇔1−3<x+2x⇔3x>−2⇔x>−231−2x<x+3⇔1−3<x+2x⇔3x>−2⇔x>−23

    So, x>4x>4 or −23<x<12


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