(2x + 3y + 4z) (4x+ 9y+ 16z - 6xy - 12yz - 8xz) = ?

1
8x3 + 27y3 + 64z3 + 72xyz
2
8x3 + 27y3 + 64z3 - 72xyz
3
8x3 + 27y3 - 64z3 + 72xyz
4
8x3 - 27y3 - 64z3 - 72xyz

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