Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1998
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1998

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

Search the Archive

Re : Simplify

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14866] Re : [mg14780] Simplify
  • From: POITEVINEAU Yvon <ypoit at lac2.gulliver.fr>
  • Date: Mon, 23 Nov 1998 10:11:47 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

Jurgen Tischer wrote :

>Subject: [mg14866] [mg14780] Simplify
>
>Could someone tell me please how to simplify the following formula?
>
>(-7253*2^(1 + 2*n)*5^n - 523*4^n*5^(1 + n) + 17121*20^n +
>    130321*20^n*n^4)/130321
>
>To my surprise when I changed by hand (with two rules) the powers of 2,
>5 and so on to powers of 20, Mathematica changed them back to this
>form.

Try this :

In[1]:= expr=(-7253*2^(1 + 2*n)*5^n - 523*4^n*5^(1 + n) + 17121*20^n +
    	130321*20^n*n^4)/130321;
	expr/20^n // Expand
Out[1]= n^4


---
Yvon Poitevineau



  • Prev by Date: non-linear regression
  • Next by Date: PlotLabel question
  • Previous by thread: non-linear regression
  • Next by thread: PlotLabel question