Question

Please tell the answer for Q40 .

Answer 1

answer is -3abc.

a+b+c=0

1. a+b=-c

2. b+c=-a

3. c+a=-b

atq

as in your question

a^2×-a + b^2×-b + c^2×-c

-(a^3+b^3+c^3)

if a+b+c=0

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

a^3+b^3+c^3= -3abc