noun
binomial theorem
Mathematical term for the expansion of (x + y)^n. Used in algebra and combinatorics.
二項定理を使って (a+b)^5 を展開した。
I expanded (a+b)^5 using the binomial theorem.
Compound of 二項 (two terms) and 定理 (theorem). A direct calque of the English 'binomial theorem'.