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!

Formulating an expression

  1. Sep 28, 2011 #1
    I'm having trouble trying to decipher this:

    A number U is on the unit interval. Write the algebraic expression for
    "U differs from 0.5 by more than 0.25"

    This is what I did...am I doing this correctly?
    0.5-U > 0.25
    after doing the algebra
    U < 0.25
  2. jcsd
  3. Sep 28, 2011 #2


    User Avatar
    Homework Helper
    Education Advisor
    Gold Member

    You have most of the right thinking on this. Better might be include the condition that it's on this unit interval.

    |0.5-U| > 0.25 AND -1<=U<=1, that is, if this unit interval is one unit from both sides of zero. You can work with that and come to you needed expression for U.
  4. Sep 28, 2011 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Unit interval.

    Should that be 0 ≤ U ≤ 1 ?
  5. Sep 28, 2011 #4
    Yes, I was under the impression that the unit interval is [0,1]
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Formulating an expression