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Homework Help: Need help in math

  1. May 10, 2012 #1
    hii guys
    i have a problem on simplifying this

    F(s) = X1(m1 s^2 + k) - KX2
    0 = X2(m1 s^2 + k) - kx1

    take x1 to have value
    x1= X2(m1 s^2 + k)/k

    F(s) = X2(m1 s^2 + k)/k . (m1 s^2 + k) - kX2

    X2 [(m1 s^2 + k)^2 -k / k]


    now we cover m1 and k by 1 because in the question they have detrmind them by 1
    soo

    X2 [(1 s^2 + 1)^2 - 1 / 1]

    soo what can i do after


    they need in the question X2(s)/F(s)



    can you help me plz on doing this
     
  2. jcsd
  3. May 10, 2012 #2
    Turn the 1/1 into 1 (why on Earth would you leave it like that), expand the squared term and go from there.
     
  4. May 10, 2012 #3
    how to expand the squared

    using this form (a^2 + 2ab + b^2) ????

    1/ (s^4 + 2s^2 + 1)

    then using partial fraction
     
  5. May 10, 2012 #4

    Mark44

    Staff: Mentor

    Shouldn't it be 1/(s^4 + 2s^2 + 1 - 1)?
     
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