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Math Help - help for partial fraction

  1. #1
    Member moonnightingale's Avatar
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    help for partial fraction

    When i solve this partial fraction, i end up with Imaginary terms
    how he has done it

    kindly explain this to me
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  2. #2
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    Quote Originally Posted by moonnightingale View Post
    When i solve this partial fraction, i end up with Imaginary terms
    how he has done it

    kindly explain this to me
    Please show all the work you did.
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  3. #3
    Member moonnightingale's Avatar
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    Quote Originally Posted by mr fantastic View Post
    Please show all the work you did.
    I am attaching the file

    Sorry file is little blur
    as i am not good in latex
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  4. #4
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    Quote Originally Posted by moonnightingale View Post
    I am attaching the file

    Sorry file is little blur
    as i am not good in latex
    It is not difficult to learn some basic latex, sufficient to write fractions and express indices. Click on the link in my signature. If you want people to make an effort and give help, you need to make an effort too.

    Since the factor s^2 + s + 10 in the denominator of the expression is a non-repeated irreducible quadratic, the term that factor contributes to the partial fraction form is \displaystyle{ \frac{as + b}{s^2 + s + 10}}.

    Knowing the original question might shed some light on what you're trying to do and why.
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  5. #5
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    You were asked to show all the work you did. You said in your first post that you got imaginary values but in
    "all" the work you show you have not even attempted to solve for A, B, and C.

    If you insist upon writing the fractions with linear, complex, denominators, then, yes, you will get imaginary values for B and C. But normally, we don't want that- we want real denominators and real coefficients. Instead try writing the fraction as
    \frac{10(s+1)}{s(s^2+ s+ 10)}= \frac{A}{s}+ \frac{Bs+ C}{s^2+ s+ 10}
    as mr fantastic suggests. Putting in three values for s will give 3 equations for real values of A, B, and C.
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  6. #6
    Member moonnightingale's Avatar
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    Thanks i have solved my queries. i have done it by completing square method and got my results

    I am learning Latex now a days. So in future i will show my complete work.
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