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Math Help - Partial Fraction Decomposition

  1. #1
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    Partial Fraction Decomposition

    I need help with this Partial Fraction, I don't know how to get A and B

    \int(2x-94)/(x^2+2x-63) dx = A/(x+9) + B/(x-7)

     2x - 94 = A(x+9)+B(x-7)

    How do I solve for A and B?
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by killasnake View Post
    I need help with this Partial Fraction, I don't know how to get A and B

    \int(2x-94)\frac(x^2+2x-63) dx = A/(x+9) + B/(x-7)

     2x - 94 = A(x+9)+B(x-7)

    How do I solve for A and B?
    i'm not sure what you're saying in your first line, but going off the second...

    let's call it equation (2)

    plug in x = -9 in (2) and solve for B

    then plug in x = 7 in (2) and solve for A
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  3. #3
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    Oh okay Thank you, sorry I was having trouble writing the question in the math format.
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by killasnake View Post
    Oh okay Thank you, sorry I was having trouble writing the question in the math format.
    use \frac {}{} to get fractions. type the numerator in the first pair of {} and the denominator in the second pair

    so [tex]\frac {2x - 94}{x^2 + 2x - 63}[/tex] yields \frac {2x - 94}{x^2 + 2x - 63}
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