4 x square + 4y square + 16 z square + 12xy - 24yz - 16xz
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(4 X4) +(4y X 4y) + (16z X16z) +12xy-24yz - 16xz
= 16+16y+ 256z+12xy - 24yz - 16xz
= 16+16y+ 256z+12xy - 24yz - 16xz
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