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Thread: Taylor Series Solution

  1. #1
    Super Member Aryth's Avatar
    Feb 2007

    Taylor Series Solution

    Consider the intial value problem:

    $\displaystyle x^2y''(x) - y(x) = 1 - x$, y(1) = 1, y'(1) = -1

    a) Identify the coefficients of the Taylor Polynomial of order of 4 around $\displaystyle x_0 = 1$ by successive differentiation of the DE. State the resulting polynomial approximation to the solution, $\displaystyle T_4(x) = $

    I've only had a one hour lecture on Taylor series solutions so I'm pretty new at this and have not had a non homogeneous problem before and also have not had one that was not centered at zero. If someone could give me a hint or maybe an example that would be awesome.
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  2. #2
    Super Member
    Aug 2008
    Hi. The Taylor series would be $\displaystyle y(x)=\sum_{n=0}^{\infty} a_n(x-1)^n=\sum_{n=0}^{\infty} \frac{y^{(n)}(1)}{n!}(x-1)^n$

    but $\displaystyle y(1)=1$ so $\displaystyle a_0=1$ and $\displaystyle y'(1)=-1$ so $\displaystyle a_1=-1$ and from the DE, $\displaystyle y''(1)=\frac{1-1+y(1)}{1}=-1$ so $\displaystyle a_2=-1/2$. Now, continue turning the crank.
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