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Binomal Expansion

  • Thread starter thomas49th
  • Start date
  • #1
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Homework Statement


Expand in ascending powers of x upto and including the term x³:

[tex]3(1-3x)^{-1} + 4(2+x)^{-2}[/tex]


Homework Equations





The Attempt at a Solution




Err never done it with 2 terms like above before. Any suggestions/hints

Thanks :)
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,230
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expand [itex](1-3x)^{-1}[/itex] up to the term in [itex]x^3[/itex] and expand [itex](2+x)^{-2}[/itex] as well up to the term in [itex]x^3[/itex], the just add them.
 

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