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Math Help - How is this answer incorrect? partial fractions

  1. #1
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    How is this answer incorrect? partial fractions


    I got that A=-x-5 and B=x^2-10 Apparently either one of them or both are wrong.
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  2. #2
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    Quote Originally Posted by badandy328 View Post

    I got that A=-x-5 and B=x^2-10 Apparently either one of them or both are wrong.
    (4/(x - 4)) - (2/(x + 4)) = (2x + 24)/[(x - 4)*(x + 4)]

    Note: x^2 - 16 = (x - 4)*(x + 4);

    Thus, 2x + 24 + (-3x - 3) = -x + 21 (Which is your "A")

    And then your B is the common denominator:

    (x - 4)*(x + 4);

    Thus, the final answer of A/B is:

    (-x + 21)/[(x - 4)*(x + 4)]
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by badandy328 View Post

    I got that A=-x-5 and B=x^2-10 Apparently either one of them or both are wrong.
    What AfterShock said plus check the question, it is very unsual for a quadratic term to be written as x^2+0x-16.

    RonL
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