Question

If x = 2015, y = 2014 and z = 2013, then value of x2 + y2 + z2 –xy–yz–zx is​

Answer 1

x = 2015

y = 2014

z = 2013

QUESTION

x2+y2+z2-xy-yz-zx

= (2015)2+(2014)2+(2013)2-(2015)(2014)-(2014)(2013)-(2013)(2015)

= 4030+4028+4026-4058210-4054182-4056195

= -12156503