using proper identity factories . 25x^2 + 16y^2 + 4z^2 - 40xy + 16yz - 20zx
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25x² + 16y² + 4z² - 4Oxy + 16yz - 2Ozx
(5x)² + (4y)² + (2z)² - 4Oy + 16yz - 2Ozx
(5x - 4y - 2z)²
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