1. ## expansion

In the expansion of , (x-3/x^2)^9 find the following:
a) the general term in simplified form
b) the term containing x^6
c) the constant term

2. ## Re: expansion

For the expansion of $\displaystyle (x+y)^n$

The general term $T_r$ can be found

$\displaystyle T_{r+1} = ^nC_rx^{n-r}y^r, \forall n\in \mathbb{Z}^+$

3. ## Re: expansion

Where do I get the "r" from?

4. ## Re: expansion

It is the 'rth' term, which represents the general term.

5. ## Re: expansion

ok what about determining the term containing x^6?

6. ## Re: expansion

Originally Posted by aprinzen
ok what about determining the term containing x^6?
Have you looked at any examples at all that are similar to your question? Perhaps in your class notes or textbook ....?

Before you can be helped any further, you need to show what you got for the general term. If you cannot get the general term, you need to show what you've tried and where you get stuck.