4x2+9y2+z2+12xy-6yz-4xz Share with your friends Share 2 Rishabh Mittal answered this 4x2+9y2+z2+12xy-6yz-4xz=-2x2+-3y2+z2+2-2x-3y+2-3yz+2z-2x=-2x-3y+z2 ANS... Since a+b+c2=a2+b2+c2+2ab+2bc+2caTaking minus common=2x+3y-z2 ANS... 5 View Full Answer Arathy Venu answered this (x+y+z) 2 so answer is (2x+3y+z) 2 1