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i) (-5x)^2+(4y)^2+(2z)^2+2(-5x)(4y)+2(4y)(2z)+2(-5x)(4z)
(-5x+4y+2z)^2
(-5x+4y+2z)(-5x+4y+2z)
(-5x+4y+2z)^2
(-5x+4y+2z)(-5x+4y+2z)
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