November 8th, 2012, 11:19 AM  #1 
Newbie Joined: Nov 2012 Posts: 4 Thanks: 0  e^x3x=0
What type of solution does e^x3x=0 have? a finite number, a surd, a fraction, a combination of constants? 
November 8th, 2012, 11:31 AM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 928 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: e^x3x=0
I believe you need Lambert's W function for this problem, so I would call it a transcendental solution. There should be two realvalued solutions (and infinitely many complex solutions).

November 8th, 2012, 11:41 AM  #3 
Newbie Joined: Nov 2012 Posts: 4 Thanks: 0  Re: e^x3x=0
and can it be written down accurately? for example pi is transcendental, but we can write be instead of 3.14159.... Does the same happen with the solution of x?

November 8th, 2012, 12:15 PM  #4  
Math Team Joined: Mar 2012 From: India, West Bengal Posts: 3,871 Thanks: 85 Math Focus: Number Theory  Re: e^x3x=0 Quote:
 
November 8th, 2012, 12:17 PM  #5 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,131 Thanks: 431 Math Focus: Calculus/ODEs  Re: e^x3x=0
You can find as many digits as you wish by using a root finding technique such as Newton's method.

November 8th, 2012, 02:32 PM  #6  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 928 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: e^x3x=0 Quote:
 
November 11th, 2012, 08:41 AM  #7 
Newbie Joined: Oct 2012 Posts: 22 Thanks: 0  Re: e^x3x=0
e^x3x=0 e^x=3x e^x=(1/3x) powering both sides to (1/3x) e^(x * (1/3x))=(1/3x)^(1/3x) e^(1/3)=(1/3x)^(1/3x) then 1/3x = ssrt(e^(1/3)) , ssrt is super sequare root used in tetration. ssrt (z) = 1/(z^^n) when n goes to infinity then x = 1/(3*(ssrt(e^(1/3)))) 
November 11th, 2012, 08:44 AM  #8 
Newbie Joined: Oct 2012 Posts: 22 Thanks: 0  Re: e^x3x=0
correction ssrt (z) = 1/((1/z)^^n) when n goes to infinity 
November 11th, 2012, 10:33 AM  #9  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 928 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: e^x3x=0 Quote:
 
November 11th, 2012, 02:24 PM  #10  
Newbie Joined: Oct 2012 Posts: 22 Thanks: 0  Re: e^x3x=0 Quote:
but ssrt(x) is elementry tool because looks like srt(x). that is why I prefer ssrt(x) than W(x).  

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