Results 1 to 3 of 3

Math Help - algebra ?? is it

  1. #1
    Junior Member
    Joined
    Oct 2007
    Posts
    37

    algebra ?? is it

    The square of Shaneequa's age six years ago is equal to her age in six years time.

    What is her present age?

    Really confused and unsure of how to put in algebraic terms. I know the answer, just don't know howto get to it.

    Thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Apr 2005
    Posts
    1,631
    Let x = her present age.
    So, x -6 = her age six years ago
    And, x +6 = her age in six years time

    (x-6)^2 = x +6
    x^2 -12x +36 = x +6
    x^2 -12x -x +36 -6 = 0
    x^2 -13x +30 = 0
    (x -10)(x -3) = 0
    x = 10 or 3 years

    When x = 10 years,
    x -6 = 10 -6 = 4 years, so she is 4 years old six years ago.

    When x = 3 years,
    x -6 = 3 -6 = -3 years, cannot be. She cannot be -3 years old anytime.

    Therefore, she is 10 years old at present. ------------answer.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Oct 2007
    Posts
    37

    Thumbs up Thankkss

    Thankksss
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: February 4th 2011, 08:39 AM
  2. Replies: 2
    Last Post: December 6th 2010, 03:03 PM
  3. Algebra or Algebra 2 Equation Help Please?
    Posted in the Algebra Forum
    Replies: 4
    Last Post: May 12th 2010, 11:22 AM
  4. Replies: 0
    Last Post: April 23rd 2010, 11:37 PM
  5. algebra 2 help
    Posted in the Algebra Forum
    Replies: 3
    Last Post: January 4th 2009, 06:24 PM

Search Tags


/mathhelpforum @mathhelpforum