1. A binomial term looks like \(a+b\), i.e. there are exactly 2 terms, a and b, added together and raised to some power.
2. The exponent n must be an integer greater than 1.
3. If you need a refresher on factorials, you can review them on the factorials page.
4. You may also see alternate notation for the factorial term like these.
\[ \frac{n!}{(n-k)!k!} = \left( \begin{array}{c} n \\ k \end{array} \right) = {}_{n}C_{k} \] The notation \( {}_{n}C_{k} \) is read 'n choose k'.
5. If you are not familiar with summation (sigma) notation, here is a good video that explains how it works.

Here is a great video explaining, step-by-step, how to use the binomial theorem with an example. When applying the binomial theorem, we sometimes say that we are finding the binomial expansion.

One way to calculate the factorial term is to use Pascal's Triangle. Here is a video explaining this with a couple of examples.