Results 1 to 5 of 5

Math Help - BASIC EQUATION

  1. #1
    Newbie
    Joined
    Sep 2008
    Posts
    8

    BASIC EQUATION

    hey i was wondering if anyone could help me solve this equation for X.

    a=1/1+x
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member bkarpuz's Avatar
    Joined
    Sep 2008
    From
    R
    Posts
    481
    Thanks
    2

    Exclamation

    Quote Originally Posted by caligyrl4lyfe View Post
    hey i was wondering if anyone could help me solve this equation for X.

    a=1/1+x
    It's so simple.
    a=\frac{1}{1+x}\text{ for }x\neq-1, we have x+1=\frac{1}{a}, which gives x=\frac{1}{a}-1=\frac{1-a}{a}.

    Note that a=0 if |x|\to\infty.
    However, this can not hold for any finite value of x.
    Last edited by bkarpuz; September 28th 2008 at 02:19 AM. Reason: Matt Westwood's post is prompted.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Aug 2007
    Posts
    144
    Hi caligyrl4lyfe,

    We have a=\frac{1}{1+x} . Multiplying both sides by 1+x yields a(1+x)=1 . Now expanding the bracket gives a+ax=1 . Minusing the a from both sides then dividing through by a leads to x=\frac{1-a}{a} . Which alternatively can be written as x=\frac{1}{a}-1 .

    Hope this helps.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member Matt Westwood's Avatar
    Joined
    Jul 2008
    From
    Reading, UK
    Posts
    783
    Thanks
    12
    Quote Originally Posted by bkarpuz View Post
    It's so simple.
    a=\frac{1}{1+x}\text{ for }x\neq-1, we have x+1=\frac{1}{a}, which gives x=\frac{1}{a}-1=\frac{a-1}{a}.

    Note that a=0 if |x|\to\infty.
    However, this can not hold for any finite value of x.
    Sorry dude, no, it's \frac{1-a}{a}.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Senior Member bkarpuz's Avatar
    Joined
    Sep 2008
    From
    R
    Posts
    481
    Thanks
    2
    Quote Originally Posted by Matt Westwood View Post
    Sorry dude, no, it's \frac{1-a}{a}.
    yes! updating my post.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: February 24th 2011, 01:02 AM
  2. Help with a basic equation
    Posted in the Differential Equations Forum
    Replies: 5
    Last Post: October 30th 2010, 11:36 AM
  3. Need help with a basic equation
    Posted in the Algebra Forum
    Replies: 8
    Last Post: February 10th 2010, 07:21 AM
  4. Basic differential equation
    Posted in the Differential Equations Forum
    Replies: 2
    Last Post: July 22nd 2009, 04:13 AM
  5. ANOTHER BASIC EQUATION
    Posted in the Algebra Forum
    Replies: 1
    Last Post: September 28th 2008, 02:13 AM

Search Tags


/mathhelpforum @mathhelpforum