Let $z, w \in \mathbb{C}$ each be a D1207: Complex number.
Let $n \in \mathbb{N}$ be a D996: Natural number.
Let $n \in \mathbb{N}$ be a D996: Natural number.
Then
\begin{equation}
(z + w)^n
= \sum_{m = 0}^n \binom{n}{m} z^m w^{n - m}
\end{equation}