(1) 4x² +9y2 + 16Z2 + 12xy - 24yz - 16xz
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Step-by-step explanation:
=(2x)2+(3y)2+(−4z)2+2(2x)(3y)+2(3y)(−4z)+2(−4z)(2x)
=(2x+3y−4z)2
=(2x+3y−4z)(2x+3y−4z)
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