Algebra Homework Help : Expansion of (a+b+c)²

How to Expand (a+b+c)² ?

(a + b + c)²
= (a + b + c)(a + b + c)
= a(a + b + c) + b(a + b + c) + c(a + b + c)
= a² + ab + ac + ba + b² + bc + ca + cb + c²

Adding like terms, the final formula (worth remembering) is

(a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ac

Practice Exercise for Algebra Module on Expansion of (a + b + c)²