Binomial Theorem
the binomial theorem (or binomial expansion) describes the algebraic expansion of powers of a binomial. According to the theorem, it is possible to expand the polynomial (x + y)n into a sum involving terms of the form a xb yc, where the exponents b and c are non-negative numbers with b + c = n, and the Coefficient a of each term is a specific positive Integer depending on n and b. For example (for n = 4), Check on the videos below to understand the concept better:
Unacademy
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MathonGo
Etoos Education
Nucleon