Explain formula "(a+b)² = a² + 2ab + b²" for (a+b)² Identity with 3 solved NCERT-style examples for Class 8 Mathematics. (Class 8 mathematics, Chapter: Algebraic Expressions and Identities)

The identity (a+b)² = a² + 2ab + b² means: to square a sum, square the first term, add twice the product of the two terms, then add the square of the second term. It works for any numbers or algebraic expressions.