We have only been taught how to do single bracket expansions, so this is my first bracket one, so please can you tell me if Ive done anything wrong?

P.S I dont know how to use the factorial method so Im using pascal's triangle. If anyone has any helpful points on the factorial method, please tell me :DQuote:

Expand the following in ascending powers of up to and including the term

Ok:

1)

Equals:

2) Multiply by first bracket:

Equals:

Note: put in brackets to make it easier to read.

3) Put in order up to

....

I got the above answer, however the book's answers got and I cannot find the extra that I am missing

I am guessing the method that I used is correct or not? and how would this question be done using the and button on my calculator?

Thankyou very much!