expansion

Please help I am having trouble with this question....

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

For the expansion of

The general term can be found

Where do I get the "r" from?

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

ok what about determining the term containing x^6?

Quote:

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Originally Posted by aprinzen

ok what about determining the term containing x^6?

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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.