# Summary Notes for Binomial Expansion – O Level Add Math In this post, I’ll share with you a summary of binomial expansion based on the O Level Additional Mathematics syllabus. You can find what’s covered in binomial expansion in this article.

There’s really nothing much to memorize for binomial expansion. Everything you need is in your formula booklet. You just need to know where to look for them. I cover these and more tips in my course on binomial expansion for O Level Additional Mathematics which you can find here

Basically for binomial expansion, you need to know how to expand a binomial series (or make something looks like a binomial so that you can apply the formula) or find a particular term.

## Binomial Expansion Formula

For powers of n which are positive integers, the following is the binomial expansion:

(a+b)n = an + nC1an-1b + nC2an-2b2 + .. + nCran-r br+ bn

## Term Formula in Binomial Expansion

Sometimes, instead of asking you to expand the expression, you are asked term independent of x, or terms with x2 and so on. To do so, you can use the term formula:

(r+1)th term  = nCran-r br