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What is the minimum value that can be achieved by the expression \(x^2+y^2+z^2+2xy+2yz+2zx-3x-3y-3z-4\) over all triples of real numbers x,y,z? Express your answer as a decimal.

 Oct 29, 2022
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The minimum value is 17.25.

 Oct 29, 2022

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