Question

Write formula (a+b+c)² = ​

Answer 1

Answer:

a2+b2+c2+2ab+2bc+2ca

PROOF:-

(a+b+c)2 can be written as (a+b+c)∗(a+b+c) ,

Therefore, (a+b+c)2=(a+b+c)∗(a+b+c)

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

=a2+ab+ca+ab+b2+bc+ca+bc+c2

=a2+b2+c2+ab+ab+bc+bc+ca+ca

=a2+b2+c2+2ab+2bc+2ca

Answer 2

use the pic and thank me and mark as brainliest