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Math Help - triangular inequality

  1. #1
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    triangular inequality

    sorry if this is the wrong section...

    im just hoping that someone can verify what i have done here:

    \mid{n^2 + 2n + 1}\mid - \mid{2n^2}\mid \geq \mid{n^2 +2n + 1 + 2n^2}\mid
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  2. #2
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    Quote Originally Posted by walleye View Post
    sorry if this is the wrong section...

    im just hoping that someone can verify what i have done here:

    \mid{n^2 + 2n + 1}\mid - \mid{2n^2}\mid \geq \mid{n^2 +2n + 1 + 2n^2}\mid
    is your inequality true for n = 1 ?
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  3. #3
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    nope

    sorry i rephrased the question a bit wrong because i was in a hurry

    i really meant it to be one of those "i dont understand what i did wrong" type questions

    essentially what i was trying to do was to use the triangular inequality in the reverse, to cram the two absolute brackets into one

    is anyone able to correct what i have done? or provide an alternative?
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  4. #4
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    Before we can tell you what you did wrong, we will have to know what you did and what you were trying to do! So far, all you have asked us to do was to verify a certain inequality which skeeter has already told you is wrong.
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