16ײy⁴+24xy²+_______
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4x 2+9y 2 +16z 2 +12xy−24yz−16xz
=(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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