Question

Please answer in quickly friends!
It's really urgent
i urge you

Answer 1

if a+b+c=0
a^3+b^3+c^3=3abc

proof a+b+c=0
a+b=-c
cubing both sides,,
(a+b)^3=,(-c)^3
a^3+b^3+3ab(a+b) = -c^3
putting the value of a+b
a^3+b^3abc=-c^3
a^3+b^3+c^3=3abc