If a2 + b2 + c2 ab - bc - ca = 0 , prove that a=b=c . Share with your friends Share 32 Lalit Mehra answered this Dear Student!Cheers! 57 View Full Answer Pranjal Gupta answered this If a2 + b2 + c2 - ab - bc - ca = 0 , prove that a=b=c -19