What is the coefficient of in the series expansion of ?

This would be easy if it were just ;however, I don't know what to do with the three terms.

Normally I would find the coefficient of such a problem as follows:

in

=

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- Nov 11th 2011, 10:58 PMterrorsquidBinomial with 3 terms inside brackets
What is the coefficient of in the series expansion of ?

This would be easy if it were just ;however, I don't know what to do with the three terms.

Normally I would find the coefficient of such a problem as follows:

in

=

- Nov 12th 2011, 12:20 AMveileenRe: Binomial with 3 terms inside brackets

You need the coefficient of , so:

. Find k and i ^^ - Nov 12th 2011, 12:21 AMOpalgRe: Binomial with 3 terms inside brackets
- Nov 12th 2011, 11:20 AMHallsofIvyRe: Binomial with 3 terms inside brackets
By the way,

**because**there are three terms, this is a "tri"-nomial, not a "bi"-nomial?