Results 1 to 6 of 6

Math Help - Rearrange for "a" which appears twice

  1. #1
    Newbie
    Joined
    Sep 2009
    Posts
    7

    Rearrange for "a" which appears twice. Still need help!

    Still Need Help

    I need to rearrange this eq, for "a" however i am confused as it appears twice but understand it can be done.

    X= [(a-b)/c-(a-Δ)] * [d/e]


    Thanks
    Last edited by chemei; September 15th 2009 at 12:34 PM. Reason: because
    Follow Math Help Forum on Facebook and Google+

  2. #2
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    Quote Originally Posted by chemei View Post
    I need to rearrange this eq, for "a" however i am confused as it appears twice but understand it can be done.

    X= [(a-b)/c-(a-Δ)] * [d/e]


    Thanks
    Which is correct?

    <br />
X = [\frac{(a-b)}{c} - (a-\Delta)] \times \frac{d}{e}

    OR

    X = \frac{a-b}{c-(a-\Delta)} \times \frac{d}{e}

    Either way the first step is to divide both sides by d/e (which is the same as multiplying by e/d)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2009
    Posts
    7
    The second one
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Sep 2009
    Posts
    7
    with a-b in brackets i.e (a-b)
    Follow Math Help Forum on Facebook and Google+

  5. #5
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    Quote Originally Posted by chemei View Post
    The second one
    <br />
X = \frac{a-b}{c-(a-\Delta)} \times \frac{d}{e}<br />

    \frac{a-b}{c-a+\Delta} = \frac{e}{d}X

    a-b = (c-a+\Delta) \times \frac{e}{d}X = \frac{ceX}{d} - \frac{aeX}{d} + \frac{\Delta eX}{d}

    a + \frac{aeX}{d} = \frac{ceX}{d} + \frac{\Delta eX}{d} + b

    Factor out a on the LHS and solve
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Sep 2009
    Posts
    7
    Thanks for that,
    I know i am asking alot but do you think you could solve for the following values, it is a long time since I have done this and am not confidient in my efforts

    a=?
    b=14.3
    c= -18.8
    d=50.6
    e=18
    Delta=4.6
    X=1
    Last edited by chemei; September 15th 2009 at 01:21 PM. Reason: left out x
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: September 16th 2011, 01:08 AM
  2. Algebra question where the "x" appears twice
    Posted in the Algebra Forum
    Replies: 3
    Last Post: June 5th 2011, 09:27 PM
  3. Replies: 2
    Last Post: April 24th 2011, 07:01 AM
  4. Replies: 1
    Last Post: October 25th 2010, 04:45 AM
  5. Replies: 1
    Last Post: June 4th 2010, 10:26 PM

Search Tags


/mathhelpforum @mathhelpforum