25x^2+y^2+9z^2-10xy-6yz
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Step-by-step explanation:
25x^2+y^2+9z^2-10xy-6yz
25x^2-10xy + y^2 + 9z^2-6yz
(5x-y)^2 + (3x-z)^2 - y^2
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