Khan Academy - Binomial Theorem
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Khan Academy unit on expanding powers of binomials, with short videos and graded practice. It moves from Pascal's triangle to combinations and the general binomial formula, so learners can expand expressions and find specific coefficients without multiplying everything out.
More resources on Binomial Theorem
Wolfram MathWorld
MathWorld is an online mathematics encyclopedia from Wolfram Research offering detailed, browsable articles on topics across the math spectrum, including algebra, geometry, calculus, and number theory. Each entry includes definitions, theorems, formulas, diagrams, worked examples, and links to further reading.
Brilliant.org - Binomial Theorem
Brilliant wiki article stating the binomial theorem, proving it combinatorially, and working through examples on coefficients, multinomial extensions, and identities. Learners practice finding terms in expansions and applying the theorem to counting and competition-style problems.
Art of Problem Solving - Binomial Theorem
Art of Problem Solving wiki entry giving the binomial theorem with a combinatorial proof, generalizations to non-integer exponents, and a set of past AMC and AIME problems with solutions, preparing students to use binomial expansions in mathematics competitions.
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