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Thread: A weird one...

  1. #1 A weird one... 
    Forum Masters Degree thyristor's Avatar
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    I know this one's easy but I just felt writing something.
    a=2*8
    b=4
    a+b=20
    (a+b)(a-b)=20(a-b)
    a*a-b*b=20a-20b
    a*a -20a=b*b-20b
    a*a-20a+100=b*b-20b+100
    (a-10)(a-10)=(b-10)(b-10)
    a-10=b-10
    a=b
    2*8=4!


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  3. #2  
    Forum Professor river_rat's Avatar
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    Hint: How do you get from (a-10)(a-10)=(b-10)(b-10) to a-10=b-10?


    As is often the case with technical subjects we are presented with an unfortunate choice: an explanation that is accurate but incomprehensible, or comprehensible but wrong.
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  4. #3  
    Forum Professor serpicojr's Avatar
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    It's alive!

    Seriously, river_rat, if you're lurking, come back. I could use some help debunking Matthew's "solution" to TSP (he just produces the greedy algorithm) and convincing William that π is indeed less than 22/7 (he's rolled some wheels around and thinks it's bigger). Both are pretty stubborn, but maybe the extra heft of another mathematician could convince them of the error of their ways. I'm sure you can think of some ideas that I haven't yet tried on these fellows.
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  5. #4  
    Forum Ph.D. william's Avatar
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    Quote Originally Posted by serpicojr
    It's alive!

    Seriously, river_rat, if you're lurking, come back. I could use some help debunking Matthew's "solution" to TSP (he just produces the greedy algorithm) and convincing William that π is indeed less than 22/7 (he's rolled some wheels around and thinks it's bigger). Both are pretty stubborn, but maybe the extra heft of another mathematician could convince them of the error of their ways. I'm sure you can think of some ideas that I haven't yet tried on these fellows.

    Be careful when talking about forum members... my name is william also. And I have no idea what thread you're talking about.

    Just trying to maintain my reputation is all.
    Cheers,
    william
    "... the polhode rolls without slipping on the herpolhode lying in the invariable plane."
    ~Footnote in Goldstein's Mechanics, 3rd ed. p. 202
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  6. #5  
    Forum Ph.D.
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    Serpicojr is referring to William McCormick.
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