Expand in ascending powers of x up to and including the term in x^3

I tried :

After partial fracting , i got

which is wrong according to the book .

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- Feb 23rd 2009, 04:01 AMthereddevilsConfirmation needed .
Expand in ascending powers of x up to and including the term in x^3

I tried :

After partial fracting , i got

which is wrong according to the book . - Feb 23rd 2009, 04:06 AMGrandadPower series
- Feb 23rd 2009, 04:28 AMthereddevils
oh thanks ... so is my working before the mistake correct ?

- Feb 23rd 2009, 05:53 AMGrandadPower series
- Feb 23rd 2009, 07:02 AMthereddevils
Absolutely yes , thanks for helping out .