(A + B + C)² Mathematical Identity Formula

The (A + B + C)² formula is one of the most important algebraic identities used in mathematics. It helps students expand the square of a trinomial quickly and accurately without performing lengthy multiplication. This identity is widely used in school mathematics, competitive examinations, engineering, and higher-level algebra.

Formula

(A + B + C)² = A² + B² + C² + 2AB + 2BC + 2CA

Explanation

When a trinomial is squared, the result is the sum of the squares of each individual term plus twice the product of every pair of terms.