In Class 11, the Binomial Theorem is introduced as an important result in algebra that allows for the expansion of expressions involving binomials raised to positive integer powers. Here’s an overview of the Binomial Theorem:

1. **Binomial Expansion**: The Binomial Theorem provides a formula for expanding expressions of the form \((a+b)^n\), where \(a\) and \(b\) are any real numbers or variables, and \(n\) is a non-negative integer. The expansion is given by:
\[(a+b)^n = \binom{n}{0} a^n b^0 + \binom{n}{1} a^{n-1} b^1 + \binom{n}{2} a^{n-2} b^2 + \ldots + \binom{n}{n} a^0 b^n\]
where \(\binom{n}{k}\) (read as “n choose k”) is the binomial coefficient, defined as \(\binom{n}{k} = \frac{n!}{k!(n-k)!}\).

2. **Binomial Coefficients**: The binomial coefficients represent the coefficients of each term in the expanded form of \((a+b)^n\). They have several important properties, including:
– Symmetry: \(\binom{n}{k} = \binom{n}{n-k}\)
– Pascal’s Triangle: The binomial coefficients can be arranged in a triangular pattern known as Pascal’s Triangle, where each number is the sum of the two numbers above it.

3. **Applications**: The Binomial Theorem has various applications in mathematics, including probability theory, combinatorics, and algebra. It is used to expand expressions, simplify calculations, and solve problems involving combinations and permutations.

4. **Extension to Negative and Non-Integer Powers**: While the Binomial Theorem is specifically for positive integer powers, it can be extended to negative and non-integer powers using concepts from calculus and series expansions.

Understanding the Binomial Theorem is important not only for its applications but also for its role in developing algebraic skills and understanding the properties of binomial coefficients.