Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

$\bf{Binomial \ Theorem}$
The Binomial Theorem can be used to expand any binomial raised to a positive integer when we have an expression in the form of $(a+b)^n$. Therefore, the missing word in the given statement is $\bf{Binomial \ Theorem}$.