Results 1 to 3 of 3

Math Help - factorising polynomials

  1. #1
    Newbie
    Joined
    Nov 2009
    Posts
    1

    factorising polynomials

    Hi does anyone know how to factorise 80 - (5k)^2

    thanks in advance.
    Last edited by mr fantastic; November 16th 2009 at 03:45 AM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by birky View Post
    Hi does anyone know how to factorise 80 - (5k)^2

    thanks in advance.
    You have (\sqrt{80})^2 - (5k)^2 so use the Difference of Two Squares formula A^2 - B^2 = (A - B)(A + B).
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Jun 2009
    From
    Africa
    Posts
    641

    Smile

    Hello
    80-(5k)^{2}=80-25k^{2}=-5(5k^2-16)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 7
    Last Post: April 7th 2011, 01:38 PM
  2. Factorising quadratic polynomials
    Posted in the Algebra Forum
    Replies: 5
    Last Post: April 22nd 2009, 06:09 PM
  3. Replies: 7
    Last Post: April 8th 2009, 08:05 AM
  4. Factorising polynomials in C
    Posted in the Algebra Forum
    Replies: 3
    Last Post: July 19th 2008, 08:09 AM
  5. Help with Factorising of Polynomials in C
    Posted in the Algebra Forum
    Replies: 3
    Last Post: February 21st 2007, 03:22 PM

Search Tags


/mathhelpforum @mathhelpforum