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!

MOD x explination please

  1. Mar 3, 2009 #1
    I am having some troubles with the beggining ideas about modulus and absolute values etc...

    i understand the basics about it but get a bit confused when they ask for the sum of different expressions or the product of different expressions
    eg

    |x - 1| + |x + 1| < 1

    or

    |x - 2|.|3x + 1| >2

    if someone could explain this so its quite easy to understand and NOT just complete these examples but explain the concepts!

    Much appreciated
     
  2. jcsd
  3. Mar 3, 2009 #2

    mathman

    User Avatar
    Science Advisor
    Gold Member

    The general idea is to break up the question into several questions without | |. For example - the first expression:
    For x > 1, (x-1)+(x+1) > 1, which becomes 2x > 1, or x > 1/2 (all x in range)
    For 1> x > -1, (1-x)+(x+1)>1, which becomes 2 >1. (all x in range)
    For -1 > x, (1-x)-(1+x) > 1, which becomes -2x > 1, or x < -1/2 (all x in range)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: MOD x explination please
  1. Mod Arithmatic (Replies: 12)

Loading...