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Math Help - solving partial fractions manually

  1. #1
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    solving partial fractions manually

    is this correct?

    \frac{8z^2}{(2z-1)(4z-1)} = \frac{A}{2z-1} + \frac{B}{4z-1}

    answer from wolfram is
    \frac{-1}{4z-1}+\frac{2}{2z-1}+1
    how did they get the +1?
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  2. #2
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    You can only do partial fractions when the degree of the numerator is less than the degree of the denominator.

    But here, the numerator and denominator both have degree 2.

    So long divide first, then use partial fractions on the remainder.
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  3. #3
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    The correct set-up is:

    \displaystyle \frac{8z^2}{(4z-1)(2z-1)} = \frac{A}{4z-1}+\frac{B}{2z-1}+C.
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  4. #4
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    The denominator is 8z^2- 6z+ 1. Clearly the leading " 8z^2" will divide into the numerator exactly once.
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