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Math Help - Solving inequalities

  1. #1
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    Solving inequalities

    Solve ln(2x+1)>3cosx
    how do i proceed?
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  2. #2
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    Re: Solving inequalities

    Quote Originally Posted by kandyfloss View Post
    Solve ln(2x+1)>3cosx how do i proceed?
    Graph \ln(2x+1)-3\cos(x).
    That will be a start.
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  3. #3
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    Re: Solving inequalities

    Quote Originally Posted by kandyfloss View Post
    Solve ln(2x+1)>3cosx
    how do i proceed?
    Plot of: \ln(2x+1)-3\cos x

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  4. #4
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    Re: Solving inequalities

    thanks princeps, okay so from the graph above. i can say ln(2x+1)-3cosx is >0 for 1.2<x<5.8 and 6.7<x<10 right?
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  5. #5
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    Re: Solving inequalities

    Quote Originally Posted by kandyfloss View Post
    thanks princeps, okay so from the graph above. i can say ln(2x+1)-3cosx is >0 for 1.2<x<5.8 and 6.7<x<10 right?
    you may conclude that 1.2 < x < 5.8 and x > 6.7 approximately
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