Question

(x+y+z) (x2+y2+z2-xy-yz-xz)​

Answer 1

x^3 + y^3 + z^3 - 3abc = (x + y + z)(x^2 + y^2 + z^2 - xy - yz - zx)
It’s an identity

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Answer 2

x3 + y3 + z3 - 3xyz = (x+y+z) (x2 + y2 + z2 - xy - yz - xz)

This is an identity.