MathGroup Archive 1996

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: HELP! algebraic math problem

  • To: mathgroup at
  • Subject: [mg2947] Re: HELP! algebraic math problem
  • From: wilson figueroa <wfigueroa at>
  • Date: Sun, 14 Jan 1996 03:42:41 -0500
  • Organization: Mosquito Net, Inc.


Since you have an equation which involves a transcendental
function, it is almost always impossible to find a closed
form solution involving x only.

At this point one needs to resort to numerical techniques.

Here you can use FindRoot[f(x) == 0, {x,x0}].  For example,

FindRoot[10*Log[x] + 2*x - 3 == 0,{x,4},
         WorkingPrecision -> 30]

would yield,

x = 1.0862...(to thirty places)

Note that I would recommend plotting the function over a range
of x.  Obviously here, x must be > 0, and plotting will help
you to see the zeros of the function.  Have fun



  • Prev by Date: Re : Moebius strip
  • Next by Date: Re: HELP! algebraic math problem
  • Previous by thread: HELP! algebraic math problem
  • Next by thread: Re: HELP! algebraic math problem