(c) 16x2+ 4y2 + 9z2 - 16xy - 12yz + 24xz
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Step-by-step explanation:
=16x^2+ 4y^2 + 9z^2-16xy- 12yz+24xz
= (4x)^2 + (2y )^2+ (3z)^2+ 2X4xX2y + 2X4xX3z+ 2X4yX3z
= (4x-2y+3z)^2
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