Prove that x² + 2y² + 3z² + 2xy+2yz - 2zx = 0 is indefinite.
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Prove that x² + 2y² + 3z² + 2xy+2yz - 2zx = 0 is indefinite.
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.