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Math Help - Partial Fraction Integration

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    Partial Fraction Integration

    how would i integrate this: 18/((x+3)(x^2+9)) tried doing the partial fraction method on it, and i cant find the values of A and B for: A/(x+3) + B/(x^2+9)
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    Quote Originally Posted by ah-bee View Post
    how would i integrate this: 18/((x+3)(x^2+9)) tried doing the partial fraction method on it, and i cant find the values of A and B for: A/(x+3) + B/(x^2+9)
    Since x^2 + 9 is an irreducible quadratic, its contribution to the partial fraction decomposition is \frac{Bx + C}{x^2 + 9}, NOT \frac{B}{x^2 + 9}.
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    ahhh... i didnt know about that, thank you!
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