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Very simple applications' issue

  1. Nov 3, 2012 #1
    1. The problem statement, all variables and given/known data
    so i want to prove that an application is bijective
    y [itex]\geq[/itex] 1we're looking for an x[itex]\geq[/itex]-2 : y= f(x)
    anyway at the end
    i have lx+2l=[itex]\sqrt{}y+1[/itex]
    the teached said x = [itex]\sqrt{}y+1[/itex]-2 without studying the other case
    Ps: the +1 is includedi nthe square root
    2. Relevant equations



    3. The attempt at a solution
    the other case lx+2l=[itex]\sqrt{}y+1[/itex]
    x+2=[itex]\sqrt{}y+1[/itex] or x+2=-[itex]\sqrt{}y+1[/itex]

    the second x is going to be <2 so we can exclude it the first x is going to be >2 we're oging to use it , but why our teacher didn't study the second case in which x+2 = -[itex]\sqrt{}y+1[/itex] ?
     
    Last edited: Nov 3, 2012
  2. jcsd
  3. Nov 3, 2012 #2

    Mark44

    Staff: Mentor

    Your LaTeX is broken, so I can't understand what you have attempted to write.
     
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