wu :: forums
        (http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi)
      

        riddles >> easy >> x^2+x+1
        
(Message started by: codpro880 on May 7th, 2009, 12:12pm)
Title: x^2+x+1
Post by codpro880 on May 7th, 2009, 12:12pm
If x^2+x+1=0, what is the value of (x^3+1/x^3)^3?
Title: Re: x^2+x+1
Post by pex on May 7th, 2009, 12:49pm

on 05/07/09 at 12:12:28, codpro880 wrote:
If x^2+x+1=0, what is the value of (x^3+1/x^3)^3?

It's [hide]. . . eight . .[/hide] because [hide](x-1)(x2+x+1)=x3-1, so we have x3=1.[/hide]
Title: Re: x^2+x+1
Post by codpro880 on May 10th, 2009, 5:42pm
yep, that was a much more clever solution than what I did. I was dealing with imaginaries...silly me.


Powered by YaBB 1 Gold - SP 1.4!
Forum software copyright © 2000-2004 Yet another Bulletin Board