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 The Trek BBS A math puzzle

 Miscellaneous Discussion of non-Trek topics.

 November 20 2012, 07:31 PM #16 SmoothieX Vice Admiral     Location: Massachusetts Re: A math puzzle I think the problem is going from line 3 to line 4. Line 3 is saying that -1^2 and 1^2 are both equal to 1. Which is true. Line 4 is telling you 1 = -1. Someone conveniently forgot order of operations (PEMDAS) here. Last edited by SmoothieX; November 20 2012 at 08:27 PM.
 November 20 2012, 08:03 PM #17 MacLeod Admiral   Location: Great Britain Re: A math puzzle BODMAS on this side of the pond. __________________ On the continent of wild endeavour in the mountains of solace and solitude there stood the citadel of the time lords, the oldest and most mighty race in the universe looking down on the galaxies below sworn never to interfere only to watch.
 November 20 2012, 08:21 PM #18 Lindley Moderator with a Soul   Location: Bonney Lake, WA Re: A math puzzle They are assuming that x^2=y^2 implies x=y, which is false. __________________ Lead Organizer for EVN: Firefly. "So apparently the really smart zombies have automatic weapons!" -Torg, Sluggy Freelance
 November 20 2012, 08:26 PM #19 SmoothieX Vice Admiral     Location: Massachusetts Re: A math puzzle I have the same math opinion as the two previous posters. 18 years later, I finally got something out of freshman HS algebra.
November 20 2012, 09:50 PM   #20
Asbo Zaprudder

Location: etherized upon a table
Re: A math puzzle

 Rhubarbodendron wrote: yep, that's what I pointed out in my last post, only less elaborate. It's quite difficult to explain mathematics in a foreign language. There are so many special terms you never learned at school. Totally off-topic, but I just have to ask: what kind of spider is the one in your avatar, Asbo Zaprudder? It's pretty!
A jumping spider - family Salticidae - although I'm not sure which one of the approx 5000 species.

 November 21 2012, 05:40 AM #21 Alidar Jarok Everything in moderation but moderation     Location: Norfolk, VA Re: A math puzzle Others have explained it, but if you write out the squares for (3 - 4) and (5 - 4) it becomes obvious: (3 - 4)^2 becomes (3 - 4) (3 - 4) So it would be: (3 - 4) (3 - 4) = (5 - 4) (5 - 4) There's no way for that to turn into 3 - 4 = 5 - 4 __________________ When on Romulus, Do as the Romulans
November 21 2012, 09:19 AM   #22
M'Sharak
Definitely Herbert. Maybe.

Location: Terra Inlandia
Re: A math puzzle

Asbo Zaprudder wrote:
 Rhubarbodendron wrote: ... Totally off-topic, but I just have to ask: what kind of spider is the one in your avatar, Asbo Zaprudder? It's pretty!
A jumping spider - family Salticidae - although I'm not sure which one of the approx 5000 species.
I think it's this kind, especially if the ID which goes with the source image is anything to go by.
__________________
Always acknowledge a fault frankly. This will throw those in authority
off their guard and give you opportunity to commit more.
~ Mark Twain

 November 21 2012, 09:21 AM #23 Asbo Zaprudder Rear Admiral     Location: etherized upon a table Re: A math puzzle These puzzles usually boil down to division by zero or multiplication by zero in one of the steps. I hadn't seen this variant before. ETA: Thanks, M'Sharak. __________________ https://www.youtube.com/watch?v=WBrc9YGPHTY
 November 21 2012, 05:10 PM #24 rhubarbodendron Commodore     Location: milky way, outer spiral arm, Sol 3 Re: A math puzzle me neither. A very nice variation of the old math trick I had suspected it to be a Salticidae - the eye position is typical. In my country we only have very small black and white striped ones (Salticus scenicus) and even tinier brown ones with 4 dots (Sitticus pubescens). Both species have black eyes with blue reflections. The green reflection in your avatar-spider's eyes is quite attractive __________________ a hug a day keeps the psychiatrist away
 November 21 2012, 08:55 PM #25 JarodRussell Vice Admiral Re: A math puzzle 3-4 is not equal to 5-4, and one can also completly above any line before that. __________________ A movie aiming low should not be praised for hitting that target.

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