Expand: 3(1-3x)^-1 + 4(2+x)^-2

[thomas49th]

Homework Statement

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

$$3(1-3x)^{-1} + 4(2+x)^{-2}$$

Homework Equations

The Attempt at a Solution

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

Thanks :)

 

[rock.freak667]

expand $(1-3x)^{-1}$ up to the term in $x^3$ and expand $(2+x)^{-2}$ as well up to the term in $x^3$, the just add them.