Results 1 to 2 of 2

Math Help - Factoring

  1. #1
    Newbie
    Joined
    May 2006
    Posts
    3

    Factoring

    Ok, the question we got was to identify and explain one critical error in the factoring example.

    this is the example:

    X=X

    X Exponent 2 = X Exponent 2

    X Exponent 2 - X Exponent 2 = X Exponent 2 - X Exponent 2

    X(X - X) = (X + X) (X - X)

    X(X - X) = (X + X) (X - X)
    -------- --------------
    (X - X) (X - X)

    X = (X + X)
    X = 2X
    If we let X = 1, then upon substitution we have
    (1) = 2(1)
    1 = 2



    I think the problem lies in line 3 right side, (X + X) (X - X), should it be like the left side X(X - X)?

    Thanks for your help.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    earboth's Avatar
    Joined
    Jan 2006
    From
    Germany
    Posts
    5,830
    Thanks
    123
    Quote Originally Posted by ferdo
    Ok, the question we got was to identify and explain one critical error in the factoring example.

    this is the example:

    X=X

    X Exponent 2 = X Exponent 2

    X Exponent 2 - X Exponent 2 = X Exponent 2 - X Exponent 2

    X(X - X) = (X + X) (X - X)

    X(X - X) = (X + X) (X - X)
    -------- --------------
    (X - X) (X - X)

    X = (X + X)
    X = 2X
    If we let X = 1, then upon substitution we have
    (1) = 2(1)
    1 = 2



    I think the problem lies in line 3 right side, (X + X) (X - X), should it be like the left side X(X - X)?

    Thanks for your help.

    Hello,

    if this means to be a division,

    X(X - X) = (X + X) (X - X)
    -------- --------------
    (X - X) (X - X)

    then you divided by (x-x) = 0 and that's not allowed.

    Greetings

    EB
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. need help with factoring
    Posted in the Algebra Forum
    Replies: 1
    Last Post: February 7th 2010, 10:47 AM
  2. factoring help
    Posted in the Algebra Forum
    Replies: 2
    Last Post: February 4th 2010, 07:44 PM
  3. Is this factoring or something?
    Posted in the Algebra Forum
    Replies: 4
    Last Post: February 1st 2010, 06:54 PM
  4. Replies: 2
    Last Post: August 22nd 2009, 10:57 AM
  5. Replies: 3
    Last Post: November 5th 2006, 11:02 PM

Search Tags


/mathhelpforum @mathhelpforum