anonymous
  • anonymous
Find all positive integers n for which \[\sqrt (n-1)+\sqrt (n+1)\] is rational
Mathematics
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anonymous
  • anonymous
Find all positive integers n for which \[\sqrt (n-1)+\sqrt (n+1)\] is rational
Mathematics
chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
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anonymous
  • anonymous
hmm i think, there is no positive integer n which works...
anonymous
  • anonymous
Well, that may be true, but how can I prove that?
anonymous
  • anonymous
well i was never good in proving things but to get a rational solution sqr.(n-1) and sqr. (n+1) have to be rational, otherwise a rational number would be added to a irrational number. so you have to find solutions for sqr. (n-1) which fit into the given conditions like: M = {2; 5; 10...} and the answers for sqr. (n+1): N= {0, 3, 8...} both sets have no common numbers and will never have one so there is no n which solves the task. that is no proof, but maybe it will help you or show that i got it wrong xD

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