1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Is there an error in this proof?

  1. Oct 13, 2006 #1
    Hello everyone, i was reviewing for the exam and I was working through this proof and I don't see how:

    (2k+1)^2-(2k+1) + 3 = 4k^2+4k+1-2k-1+3 = 2(2k^2-k+1)+1

    http://suprfile.com/src/1/3q9w3ud/Untitled-1[/URL] [Broken] copy.jpg[/PLAIN] [Broken]

    But it is late so i maybe not seeing somthing.
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Oct 13, 2006 #2
    If it is any help, there is an arithmetic error in the proof. Not that it makes any difference to the proof, but 4K-2K is +2K, not -2K.
  4. Oct 14, 2006 #3
    ahh okay thats what i wanted to make sure!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Is there an error in this proof?
  1. A proof! (Replies: 0)

  2. Matrix/Error Proof? (Replies: 3)