if a + b+ c=0 then a3 +b3+c3 is equal to what
using a3 + b3 + c3 - 3abc = ( a + b + c ) ( a2 + b2 + c2 - ab - bc - ca )
here if a+b+c = 0 then the answer will be 3abc because in RHS ( a + b + c ) becomes 0(zero) in multiplying the whole becomes 0. and when transposing -3abc it becomes +3abc. so here it becomes
a3 + b3 + c3 = 3abc
hope u r clear wid it!! :D