Question

Verify x³+y³+z³-3xyz=(x+y+z)[(x-y)²+(y-z)²+(z-x)²] and factor is 64x³+125y³-64z³+240xy²

Answer 1

(4x+5y-4z)(16x^2+25y^2+16z^2-20xy-20yz-16xz)