how to prove the identiy a3+b3+c3 -3abc Share with your friends Share 2 Shubham Chourasiya answered this 0 View Full Answer Aman Bhura answered this A3+B3+C3 -3ABC(A+B+C)(A2 +B2 +C2 -AB-BC-CA) IF A+B+C=0 ,then A3+B3+C3 -3ABC=0*(A2 +B2 +C2 -AB-BC-CA)=A3+B3+C3 -3ABC proved or A3+B3+C3 -3ABC=0 = A3+B3+C3 =3ABC PROVED 1