Results 1 to 3 of 3

Math Help - Perfect Square

  1. #1
    Newbie
    Joined
    Oct 2007
    Posts
    2

    Perfect Square

    An intger is simultaniously a square & cube is of the form 7k or 7k+1
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by Amit kumar View Post
    An intger is simultaniously a square & cube is of the form 7k or 7k+1
    umm...are you asking a question? or are you telling us a fact?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Global Moderator

    Joined
    Nov 2005
    From
    New York City
    Posts
    10,616
    Thanks
    9
    He is asking to show that an integer that is a cube an a square at the same time either leaves 0 or remainder 1 upon division by zero.

    Let a = 7k,...,7k+6 then a^2 = 7k,7k+1,7k+2,7k+4 and a^3 = 7k,7k+1,7k+6 the possible forms they have in common are 7k,7k+1.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. perfect square trinomial/square of binomial
    Posted in the Algebra Forum
    Replies: 2
    Last Post: March 3rd 2011, 04:02 PM
  2. Replies: 1
    Last Post: July 21st 2010, 02:24 PM
  3. Perfect square
    Posted in the Number Theory Forum
    Replies: 13
    Last Post: April 10th 2010, 12:57 PM
  4. N! is never a perfect square
    Posted in the Number Theory Forum
    Replies: 7
    Last Post: December 9th 2009, 09:41 AM
  5. Perfect square
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: October 19th 2008, 08:05 PM

Search Tags


/mathhelpforum @mathhelpforum