Winamp & Shoutcast Forums basic algebra question/riddle
 User Name Remember Me? Password

 Thread Tools Search this Thread Display Modes
 17th August 2012, 02:37 #1 swingdjted DRINK BEER NOW(Forum King)     Join Date: Feb 2006 Location: Northern West Virginia Posts: 9,990 basic algebra question/riddle I've reviewed this and can't seem to find the error. Where does this go wrong? Can someone go from line 4 to line five by arbitrarily tossing in the -2ab to both sides? I know it seems equal when you do that, as it looks like you can toss anything in there as long as it's balanced, but I don't know for sure. Help me out here. Don't forget to live before you die.
 17th August 2012, 03:12 #2 thinktink Forum King     Join Date: May 2009 Location: On the streets of Kings County, CA. Posts: 3,009 if a=b then on the 5th line where -2ab is introduced the expression on the left-hand side of the equation simplifies to zero and also does the right-hand side: `code:0=0` Both expressions on either side of the equality gets canceled out to zero. By the looks of it, it's a deliberate attempt to obfuscate the effect of adding -2ab to both sides. `code:2*Squared(a)-2ab=0 if a=b` http://en.wikipedia.org/wiki/Mathematical_fallacy Then there's also that pesky thing in algebra that you can't divide by zero, which is what the last step does, dividing both sides by (a squared - a*b), which is equal to zero if a=b. http://www.math.toronto.edu/mathnet/...fs/guess8.html Last edited by thinktink; 17th August 2012 at 03:45. Reason: grammar
17th August 2012, 04:06   #3
fc*uk
Moderator

Join Date: Dec 2005
Location: Atlantic Beach
Posts: 8,127
Quote:
 Originally Posted by thinktink Then there's also that pesky thing in algebra that you can't divide by zero, which is what the last step does, dividing both sides by (a squared - a*b), which is equal to zero if a=b.
Oh fuck, wait. No, no, no. Bad things happens when you divide by zero.

Shit. You can't do that!

There are hundreds of variants of this and they all have the same flaw: division by zero somewhere.

 17th August 2012, 04:17 #4 swingdjted DRINK BEER NOW(Forum King)     Join Date: Feb 2006 Location: Northern West Virginia Posts: 9,990 The first thing you mentioned is what I missed. I failed to simplify on my own rather than look at the picture. Had I done that after each presented line, the rest of what you typed would have been blatantly obvious. Thank you for that, because I was turning my head a little sideways when looking at that. I'm better now. Don't forget to live before you die.
 17th August 2012, 04:53 #5 thinktink Forum King     Join Date: May 2009 Location: On the streets of Kings County, CA. Posts: 3,009 You're welcome. Debunking fallacious algebra proofs since 2012.
 17th August 2012, 15:02 #6 . - .... .- -. .... BackpackingModerator     Join Date: Nov 2000 Location: საქართველო (Georgia) Posts: 10,104 a squared is not necessarily equal to 2*a that's where the formula falls apart. Like my photography? Buy some here....
 17th August 2012, 15:55 #7 swingdjted DRINK BEER NOW(Forum King)     Join Date: Feb 2006 Location: Northern West Virginia Posts: 9,990 It didn't have that error, because the 2a squared came from the line above where it was a squared plus a squared. Don't forget to live before you die.
 18th August 2012, 02:51 #8 thinktink Forum King     Join Date: May 2009 Location: On the streets of Kings County, CA. Posts: 3,009 I swear, the forums could benefit with superscript and subscript formatting tags.
 18th August 2012, 03:03 #9 swingdjted DRINK BEER NOW(Forum King)     Join Date: Feb 2006 Location: Northern West Virginia Posts: 9,990 Some people type "A squared" as a^2. The same people often type "A sub 2" as av2 although the former is more common than the latter. Also you could type the tag out even though it doesn't do anything e.g. "A squared" becomes A[superscript]2[/superscript] or "A sub 2" becomes A[subscript]2[/subscript], but that would just look silly. Don't forget to live before you die.
 18th August 2012, 19:42 #10 Rellik Major Dude     Join Date: Oct 2003 Location: localhost Posts: 1,099 I've seen other vbb forums use [sup]2[/sup] and [sub]2[/sub], why it's not here I don't know. if all you need are superscript numbers, then unicode is your friend: ¹²³⁴⁵⁶⁷⁸⁹⁰ⁱ⁽⁾⁺⁻⁼ⁿ just copy and paste what you need PHP Code: ```        a=b       a²=ab    a²+a²=a²+ab      2a²=a²+ab  2a²-2ab=a²+ab-2ab  2a²-2ab=a²-ab 2(a²-ab)=1(a²-ab)        2=1  ``` oh, and subscript: ᵢᵣᵤᵥᵦᵧᵨᵩᵪ₀₁₂₃₄₅₆₇₈₉₊₋₌₍₎ₐₑₒₓₔ
 18th August 2012, 20:41 #11 swingdjted DRINK BEER NOW(Forum King)     Join Date: Feb 2006 Location: Northern West Virginia Posts: 9,990 Ahh, nice. I'll have to keep this thread in mind for copy pasta from your post. I used to use unicode a lot because I had a nice small document with a lot of the most common unicode characters there for copy-paste, but I've since lost the document. Don't forget to live before you die.
 18th August 2012, 20:56 #12 Rellik Major Dude     Join Date: Oct 2003 Location: localhost Posts: 1,099 If you know what you are looking for, you can search the Character Map in Windows
 8th October 2012, 03:12 #13 iomegajaz Balled and Chained Alumni   Join Date: Jun 2000 Posts: 5,237 This did my head in for a few minutes, until I realised that 1(X) = n(X), so long as X = 0, which is what this riddle does. Tricky bastards. "My heart hates uggos." –J.D.
 Winamp & Shoutcast Forums basic algebra question/riddle
 User Name Remember Me? Password

 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Tech Support Greatest Hits Winamp     Winamp Technical Support     Winamp Discussion     Winamp Wishlist     Winamp Bug Reports     Winamp for Android     Winamp Site Design Shoutcast     Shoutcast Technical Support     Shoutcast Discussions     Shoutcast For Business & Monetization     Shoutcast Site Design International Connection     International Connection     Русскоязычный форум (Russian)     Français: de l'aide pour les francophones (French)     Winamp Deutsch (German) Community Center     General Discussions     Breaking News     Music O'Rama     Games Center     Movies and Television     The Bitchlist Skinning and Design     Skinning Tips and Tricks     Classic Skins     Modern Skins     Arts and Design Developer Center     Winamp Development     NSIS Discussion         NSIS Translations Visualizations     AVS         AVS Presets         AVS Wishlist         AVS Troubleshooting     MilkDrop         MilkDrop Presets         MilkDrop Development         MilkDrop Feature Requests         MilkDrop Troubleshooting Forum

 -- Deutsch -- English (US) -- Polish -- Russian Winamp.com - Help - Archive - Top