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Homework Help: 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!
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