Question

If a + b + c equal to zero then a square + ab + b square equal to

Answer 1

When a+b+c = 0 

then formula of a²+b²+c²+ab+BC+ca is (a+b+c)(a²+b²+c²+2ab+2bc+2ca)

hence

by putting the vale of a+b+c 

0 × a²+b²+c²+2ab+2bc+2ca