Question

(a+b+c)² = a² + b² + c² + 3ab + 3bc +3ac​

Answer 1

Answer:

(a+b+c)²=a²+b²+c²+2ab+2bc+2ca

Step-by-step explanation:

(a+b+c) (a+b+c)

a(a+b+c)+b(a+b+c)+c(a+b+c)

a²+ab+ac+ab+b²+bc+ac+bc+c²

a²+ab+ab+ca+ca+bc+bc+b²+c²

a²+2ab+2ca+2bc+b²+c²

a²+b²+c²+2ab+2bc+2ca