Results 1 to 3 of 3

Math Help - √u^2 =u for any number u. True or False?

  1. September 20th 2011, 06:07 AM #1
    naturebuilder
    naturebuilder is offline
    Newbie
    Joined
    Sep 2011
    Posts
    2

    √u^2 =u for any number u. True or False?

    √u^2 =u for any number u. True or False?

    i think it's true...
    Last edited by mr fantastic; September 20th 2011 at 07:30 PM. Reason: Copied title into main body of post.
    Follow Math Help Forum on Facebook and Google+
  2. September 20th 2011, 06:14 AM #2
    Plato
    Plato is online now
    MHF Contributor
    Joined
    Aug 2006
    Posts
    18,385
    Thanks
    1475
    Awards
    1
    MHF Donor

    Re: √u^2 =u for any number u. True or False?

    Quote Originally Posted by naturebuilder View Post
    i think it's true...
    It is false: \sqrt{(-2)^2}\ne -2~.
    Follow Math Help Forum on Facebook and Google+
  3. September 20th 2011, 11:19 AM #3
    psolaki
    psolaki is offline
    Member
    Joined
    Jul 2011
    Posts
    81
    Thanks
    1

    Re: √u^2 =u for any number u. True or False?

    Quote Originally Posted by naturebuilder View Post
    i think it's true...

    \sqrt{(u)^2}= |u|
    Follow Math Help Forum on Facebook and Google+
« Solving Rational Equations | How can these roots be real? »

Similar Math Help Forum Discussions

  1. prove whether the set property is true, false, or sometimes true and sometimes false?
    Posted in the Discrete Math Forum
    Replies: 7
    Last Post: October 5th 2011, 12:45 PM
  2. Prove whether the set property is always true, always false, or sometimes true or fal
    Posted in the Discrete Math Forum
    Replies: 1
    Last Post: October 4th 2011, 02:19 AM
  3. True or False. Prove if true show counter example if false.
    Posted in the Differential Geometry Forum
    Replies: 0
    Last Post: March 2nd 2010, 10:54 AM
  4. Number of integral terms in the expansion of (√6 + √10 + √15)^6 is?
    Posted in the Calculus Forum
    Replies: 2
    Last Post: February 14th 2009, 12:12 PM
  5. true or false . For every number x, x<13 or x>6
    Posted in the Discrete Math Forum
    Replies: 3
    Last Post: October 23rd 2007, 12:29 PM

Search Tags


/mathhelpforum @mathhelpforum