Question

give the correct ans
(a+b+c)^2=​

Answer 1

Answer:

The formula is:

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

Answer:

(a+b+c)²=a²+b+c²

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