Find first five non-zero terms of power series

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Remember, this an online system. Each of your coefficients is correct but perhaps you are missing the variables. For instance, the first term is $2x/25$ not its coefficients (because there can be constant terms in a Taylor Series). Similarly, the second term is $4x^2/125$, and so forth.

It could also be because it wants the coefficients of the terms but in order of powers, so it would $0$, $2/25$, $4/125$, etc. Though this seems less like than the first.

Overall, this seems less an issue of the mathematics - as your terms are correct, as it does how you are entering it or with the system itself. Just send a quick email to your instructor! They can see the solutions and thus perhaps more quickly tell what is incorrect about how the system wants the answer. As an instructor, I always found WebWork/WebAssign to be a bit wonky from time to time.

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BOBBY SHMURDA
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BOBBY SHMURDA

Updated on June 12, 2021

Comments

  • BOBBY SHMURDA
    BOBBY SHMURDA over 2 years

    I have the function f(x) = $\dfrac{2x}{\left(x-5\right)^2}$, and I'm supposed to "find the first five non-zero terms of power series representation centered at x = 0."

    Using $\frac{f^{(n)}(0)}{n!}$, the first non-zero terms I get are:

    C1 = 2/25

    C2 = 4/125

    C3 = 6/625

    C4 = 8/3125

    C5 = 2/3125

    However, WebWork marks these as incorrect. Any alternative methods or corrections to the work above are gladly appreciated.

    • Dando18
      Dando18 almost 5 years
      those are the terms wolfram alpha gives.
    • BOBBY SHMURDA
      BOBBY SHMURDA almost 5 years
      Does that mean the terms I listed are correct?
    • Dando18
      Dando18 almost 5 years
      It seems so... Unless the question is asking for something else.