Results 1 to 7 of 7

Math Help - stuck

  1. #1
    Newbie
    Joined
    Sep 2009
    Posts
    13

    stuck

    Hi, I'm almost at the end of a question but i seem to be stuck. I have the answer though.. so im up to here so can someone please help me arrange this

     (\frac{n + \frac{1}{c}}{\frac{s}{n} }) [\mu^2 - 2\mu(\frac{n \overline{y}}{n+\frac{1}{c}})]

    and make it equal to

     \frac{n + \frac{1}{c}}{\frac{s}{n} + \frac{\overline{y}(\frac{1}{c})}{(n + \frac{1}{c})}}[\mu - (\frac{n\overline{y}}{n + \frac{1}{c}})]^2

    or if you don't want to give me the full thing, the next line would really help guide me coz i just have no idea what to do
    thank you, coz ive tried everything i could think of and nothing seems to work.. Please?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member MacstersUndead's Avatar
    Joined
    Jan 2009
    Posts
    291
    Thanks
    32
     (\frac{n + \frac{1}{c}}{\frac{s}{n} }) [\mu^2 - 2\mu(\frac{n \overline{y}}{n+\frac{1}{c}})]

    Notice that what's in the square brackets is almost a perfect square.

    So, add and subtract the ((last term inside the square brackets)/2)^2 all squared), a form of 0, inside the square brackets. The first three terms in the square brackets make up the perfect square equal to ... can you finish?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member MacstersUndead's Avatar
    Joined
    Jan 2009
    Posts
    291
    Thanks
    32
    double post
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Sep 2009
    Posts
    13
    Quote Originally Posted by MacstersUndead View Post
     (\frac{n + \frac{1}{c}}{\frac{s}{n} }) [\mu^2 - 2\mu(\frac{n \overline{y}}{n+\frac{1}{c}})]

    Notice that what's in the square brackets is almost a perfect square.

    So, add and subtract the ((last term inside the square brackets)/2)^2 all squared), a form of 0, inside the square brackets. The first three terms in the square brackets make up the perfect square equal to ... can you finish?
    ahhh thank you!!

    but okies, so here's what i have:
     (\frac{n + \frac{1}{c}}{\frac{s}{n} }) [(\mu - \frac{n\overline{y}}{n + \frac{1}{c}})^2 - (\frac{n\overline{y}}{n + \frac{1}{c}})^2]

    but i don't know what to do with the leftover  (\frac{n\overline{y}}{n + \frac{1}{c}})^2.. did i do the perfect square thing wrong?
    Last edited by bubbling; September 27th 2009 at 08:37 PM.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Senior Member MacstersUndead's Avatar
    Joined
    Jan 2009
    Posts
    291
    Thanks
    32
    Oh right, sorry, should have said (coefficient/2)^2 for completing the square, my bad. I would say expand and see where that takes you.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Sep 2009
    Posts
    13
    hmm..? sorry im really dumb, what do you mean by coefficient? which coefficient?
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Senior Member MacstersUndead's Avatar
    Joined
    Jan 2009
    Posts
    291
    Thanks
    32
    [\mu^2 - 2\mu(\frac{n \overline{y}}{n+\frac{1}{c}})]

    The coefficient of your second term is 2(\frac{n \overline{y}}{n+\frac{1}{c}}), which is the one you need to divide by two and then square to get what you need to add and subtract to complete the square.

    You completed the square correctly.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Stuck
    Posted in the Algebra Forum
    Replies: 6
    Last Post: January 21st 2010, 12:09 PM
  2. stuck with sin^4(x)
    Posted in the Calculus Forum
    Replies: 1
    Last Post: March 24th 2009, 05:56 PM
  3. Stuck on a Log :(
    Posted in the Algebra Forum
    Replies: 9
    Last Post: January 21st 2008, 01:10 PM
  4. somebody help me plz im so stuck
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: September 30th 2007, 12:43 PM
  5. Stuck, Stuck, Stuck - Need Help Urgently
    Posted in the Algebra Forum
    Replies: 3
    Last Post: May 17th 2005, 06:46 AM

Search Tags


/mathhelpforum @mathhelpforum