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4x^2 + 9y^2 + 16z^2 +12xy -24yz - 16xz
= (2x)^2 + (3y)^2 + (-4z)^2 + 12xy - 24xy - 16xz
= (2x + 3y - 4z) ^2
= (2x)^2 + (3y)^2 + (-4z)^2 + 12xy - 24xy - 16xz
= (2x + 3y - 4z) ^2
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