Question

if given x=175 ,y=176,z=177then x2+y2+z2-xy-yz-zx=?​

Answer 1

(1/2)[(x-y)²+(y-z)²+(z-x)²]

(1/2)[(175-176)²+(176-177)²+(177-176)²

(1/2)(1+1+1)

(1/2)(3)

1.5