Hey,

Doing homework, and came across this question. I cannot for the life of me figure out what I am doing wrong, but it doesn't match up to the answer at the back of the book. It does on wolfram alpha. So am I doing this correctly?

Question:

Find the first five terms in the expansion of each of the following:

b)

My attempted answer:***I do not know how to show combinations using Latex, so hopefully this makes sense. Example: is "8 choose 0"***

First Term:

Second Term:

Third Term:

Fourth Term:

Fifth Term:

Answer at back of book:

Wolfram alpha: http://www.wolframalpha.com/input/?i=%282a+%2B+%283a^%28-2%29%29%29^8