Results 1 to 5 of 5

Math Help - Changing the subject of a Formula

  1. #1
    Newbie
    Joined
    Apr 2011
    Posts
    2

    Smile Changing the subject of a Formula

    Hi there having an issue with this question, could anyone show the steps involved on how to changing the subject of a formula

    a) Make U the subject :- s = 1/2 (u+v) t

    b) Make K the subject :- d = √6M/Kx+1 (Square root is on the whole fraction)

    Thanks in advance

    Blonde
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member Quacky's Avatar
    Joined
    Nov 2009
    From
    Windsor, South-East England
    Posts
    901
    Transposing:

    S=\dfrac{u+v}{2}\times~t

    Divide both sides by t:

    \dfrac{S}{t} = \dfrac{u+v}{2}

    Multiply both sides by 2:

    \dfrac{2S}{t}=u+v

    Subtract v from both sides:

    u=\dfrac{2S}{t}-v

    Post an attempt at b) yourself using similar methods; start by squaring both sides.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Apr 2011
    Posts
    2
    http://i.imgur.com/WHvdB.jpg

    I uploaded a picture with proper formula in it.

    I think its right but not 100% sure.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Apr 2011
    Posts
    21
    I like the way ducky sets out the steps and says whats happening as opposed to
    voila: here is the answer
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Super Member Quacky's Avatar
    Joined
    Nov 2009
    From
    Windsor, South-East England
    Posts
    901
    Lol, Ducky. I like it.

    Yes, that's correct. Remember though that you can only take the reciprocal of both sides in that way between stages 2 and 3 because each side is a single, combined fraction/term.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Changing the subject of a formula
    Posted in the Algebra Forum
    Replies: 11
    Last Post: August 10th 2010, 04:52 AM
  2. Changing the subject of the formula
    Posted in the Algebra Forum
    Replies: 1
    Last Post: May 19th 2009, 06:57 AM
  3. Changing the subject of the formula
    Posted in the Algebra Forum
    Replies: 1
    Last Post: March 23rd 2009, 07:14 AM
  4. Changing subject of formula
    Posted in the Algebra Forum
    Replies: 3
    Last Post: March 16th 2009, 10:22 AM
  5. changing the subject of a formula
    Posted in the Algebra Forum
    Replies: 3
    Last Post: April 15th 2007, 11:00 AM

Search Tags


/mathhelpforum @mathhelpforum