
New Users Post up here and introduce yourself! 
 LinkBack  Thread Tools  Display Modes 
September 8th, 2013, 09:19 PM  #1 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,950 Thanks: 987  Eddybob's problem of the week
Here's what Wolfram has if the 10^10 is replaced by a (10^20 = a^2): http://www.wolframalpha.com/input/?i=so ... %3D0+for+x YIKES 
September 9th, 2013, 03:20 PM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Eddybob's problem of the week
Weird. Where do all the decimals come from?

September 9th, 2013, 08:06 PM  #3 
Senior Member Joined: Sep 2012 From: British Columbia, Canada Posts: 764 Thanks: 53  Re: Eddybob's problem of the week
Get the roots to 4 decimal places. I understand that the exact values are quite complicated.

September 9th, 2013, 09:15 PM  #4  
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,950 Thanks: 987  Re: Eddybob's problem of the week Quote:
here: http://www.numberempire.com/equationsolver.php  
September 10th, 2013, 01:21 PM  #5 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,950 Thanks: 987  Re: Eddybob's problem of the week
x^4  (2*10^10  1) * x^3  x + 10^20 + 10^10  1 = 0 Let k = 10^10; then we have a quadratic: k^2 + (1  2x^3)k + x^4 + x^3  x  1 = 0 2k = 2x^3  1 + SQRT(4x^6  4x^4  8x^3 + 4x + 5) Ya, I know...so what!? 
September 10th, 2013, 04:23 PM  #6 
Senior Member Joined: Sep 2012 From: British Columbia, Canada Posts: 764 Thanks: 53  Re: Eddybob's problem of the week
You really know how to cheat, do you? 
September 10th, 2013, 07:53 PM  #7 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,950 Thanks: 987  Re: Eddybob's problem of the week
If you say so...


Tags 
eddybob, problem, week 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Last problem of the week  mathkid  Algebra  2  February 24th, 2013 09:20 PM 
Calculus exam next week need help!  faiint  Calculus  6  November 18th, 2012 12:34 AM 
In what order should I take these in a week  sivela  Math Books  1  June 22nd, 2010 10:41 AM 