27) Given x, y, z \(\in Z\) and a = x2 - yz c = z2 - xy b = y2 - xz Prove that: a3 + b3 + c3 - 3abc is a square number.
27) Given x, y, z \(\in Z\) and
a = x2 - yz c = z2 - xy
b = y2 - xz
Prove that: a3 + b3 + c3 - 3abc is a square number.
