Q.79. If x 2 + y 2 + z 2 - x y - y z - z x = 0 then the value of x + y z is (A) 2 (B) 1 (C) xy (D) yz Share with your friends Share 0 Manbar Singh answered this Dear Student, Now, x + yz = x + xx = 2 Regards 1 View Full Answer