Question

If a+b+c=0,then ab(a+b)+bc(b+c)+ca(a+c)+3(a+b+c)=?

Answer 1

the answer is 3.
hope it helps

Answer 2

Given

A + b + C =0

ab{-c}+bc{-a}+ca{-b}+3(a+b+c)

=-abc-abc-abc+0

-3abc