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mrtuba Group Title

integral of (3x^3+2x^2+7x+13)/((x-1)^2(x^2+4)^2)

  • 2 years ago
  • 2 years ago

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  1. candrie Group Title
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    http://myalgebra.com/algebra_solver.aspx Plug your problem in here

    • 2 years ago
  2. mrtuba Group Title
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    \[\int\limits_{}^{}(3x^3+2x^2+7x+13)/((x-1)^2(x^2+4)^2)\]

    • 2 years ago
  3. myininaya Group Title
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    Did you try partial fractions Are is partial fractions what you need help on?

    • 2 years ago
  4. myininaya Group Title
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    oops or* lol sorry

    • 2 years ago
  5. mrtuba Group Title
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    i did partial fractions but its so incredibly terrible that the expanded for after cross multiplication took up to line of college rule paper written in small print. I feel like there is some simplifying i could do before doing partial fractions

    • 2 years ago
  6. myininaya Group Title
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    It does look like it can nasty but I don't see any other way to go about it but... just because i don't see any other way doesn't mean it doesn't exist

    • 2 years ago
  7. myininaya Group Title
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    \[\frac{3x^3+2x^2+7x+13}{(x-1)^2(x^2+4)^2}\] \[=\frac{A}{x-1}+\frac{B}{(x-1)^2}+\frac{Cx+D}{x^2+4}+\frac{Ex+F}{(x^2+4)^2}\] Yeah this is going to be ugly

    • 2 years ago
  8. myininaya Group Title
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    So you didn't find those constant values for A,B,C,D,E and F right?

    • 2 years ago
  9. mrtuba Group Title
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    no i just saw the set up after cross multiplying and expanding looked so crazy that i thought i had to have missed something that could make it easier.

    • 2 years ago
  10. myininaya Group Title
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    \[=\frac{A(x-1)(x^2+4)^2}{(x-1)^2(x^2+4)^2}+\frac{B(x^2+4)^2}{(x-1)^2(x^2+4)^2}+\frac{(Cx+D)(x-1)^2(x^2+4)}{(x-1)^2(x^2+4)^2}+\frac{(Ex+F)(x-1)^2}{(x^2+4)^2(x-1)^2}\] \[3x^3+2x^2+7x+13=A(x-1)(x^2+4)^2+B(x^2+4)^2+ \] \[(Cx+D)(x-1)^2(x^2+4)+(Ex+F)(x-1)^2 \] And then continue from here ....

    • 2 years ago
  11. mrtuba Group Title
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    yeah i went past that, just looks like this one will be ugly i guess ill just keep chugging thanks.

    • 2 years ago
  12. myininaya Group Title
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    Sorry... I'm not able to offer an easier way :(

    • 2 years ago
  13. myininaya Group Title
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    I don't think there is one...

    • 2 years ago
  14. malevolence19 Group Title
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    Plug in X=1 to get a value, x=0 might also help

    • 2 years ago
  15. mrtuba Group Title
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    can not figure out the system of equations this leads me to

    • 2 years ago
  16. agentx5 Group Title
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    1. Carefully check your + and - signs in the original problem. You've currently an unfactorable polynomial in the numerator with a larger, higher degree polynomial in the denominator. I'd agree with @myininaya's approach. One missed sign could make it factorisable such that something could simplify/cancel out and the whole thing become much more feasible. 2. There isn't an easier way, that I can see either, you're just going to have to solve that system of equations, namely you're going to have to use both methods of combining systems of equations and making substitutions, AND using known vertical asymptote values for the denominator (in this case +1 and 2i). Yes, I'm serious, use an imaginary root here, you kind of have to. Post your system of equation here, and try those roots, see what happens (things cancel out). 3. Using that I got: A = 0 B = 1 C = 0 D = -1 E = 1 F = 1 You'll also need to make use of this fact: \[\frac{d}{dx}(\frac{1}{a} \tan^{-1}(\frac{x}{a})) = \frac{1}{x^2+a^2}\] This problem as written is do-able, but it's a lot of work and will also most likely also force you to remember some anti-derivatives which have trig function forms and make use of half-angle and double-angle formulas too. So you got a lot of work to do, better get to it eh? ;-D

    • 2 years ago
  17. eliassaab Group Title
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    Here is a summary and a conclusion to what have been above and what have not been \[ \frac{3 x^3+2 x^2+7 x+13}{(x-1)^2 \left(x^2+4\right)^2}=\frac {x+1}{\left(x^2+4\right)^2} -\frac{1}{x^2+4}+\frac{1}{( x-1)^2}\\ \int \left(\frac{x+1}{\left(x^2+4\right)^2}-\frac{1}{x^2+4}+\frac{1}{(x-1)^2}\right) \, dx=\\\frac{x-4}{8 \left(x^2+4\right)}-\frac{1}{x-1}-\frac{7 }{16} \tan ^{-1}\left(\frac{x}{2}\right)+ C \]

    • 2 years ago
  18. agentx5 Group Title
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    @eliassaab is 100% correct :-)

    • 2 years ago
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