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!

Homework Help: 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


    Staff: Mentor

    Your LaTeX is broken, so I can't understand what you have attempted to write.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook