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Re: The Math Thread

Posted: 14 May 2013 14:36
by Vortex
So we need to figure out something? XD

Re: The Math Thread

Posted: 14 May 2013 14:41
by The Abacus
I never knew it was a puzzle either XD

Re: The Math Thread

Posted: 14 May 2013 14:43
by Vortex
Google says it's the amelia sequence, that was invented for a show or something.

EDIT: and it draws some relations, but I don't know if they're significant at all...

Re: The Math Thread

Posted: 14 May 2013 17:06
by Vurn
Okay, so how do you solve shit like
(x^2)-x=870
Like, I know it's 30 know, but how do you solve it
it's been driving me mad ahhh
(^ means a power)

Re: The Math Thread

Posted: 14 May 2013 17:28
by Anteroinen
Well,

x=(-b+/-sqrt(b^2-4ac))/2a

I think.

Re: The Math Thread

Posted: 14 May 2013 18:02
by Vortex
Yeah, you have to put it in the form a*x^2 + b*x + c = 0 (in your example it would be 1*x^2 -1*x -870 = 0), and then use the formula Anteroinen told above (there are always 2 solutions).

In your example:

x1= (1 + sqrt((-1)^2-4*1*(-870))/2*1 = (1 + sqrt(3481))/2 = (1+59)/2 = 60/2 = 30

and the other solution:

x2= (1 - sqrt((-1)^2-4*1*(-870))/2*1 = (1 - sqrt(3481))/2 = (1-59)/2 = -58/2 = -29

Re: The Math Thread

Posted: 14 May 2013 21:15
by WorldisQuiet5256
Over thinking it.
It is related to a show, but I made the connection in real life.

Re: The Math Thread

Posted: 18 May 2013 04:21
by Boingo
Phi. 1.618.
Awesome number.

Re: The Math Thread

Posted: 18 May 2013 06:30
by The Kakama
Indeed, you could do all sorts of fun stuff with it.

Re: The Math Thread

Posted: 18 May 2013 06:48
by Boingo
I could measure the dimensions of my head, for example. :P