How do I complete the square for: [tex]x^2 + 2y^2 + 2z^2 + 4xy +4xz + 4yz[/tex](adsbygoogle = window.adsbygoogle || []).push({});

I can do it for a normal quadratic [itex]ax^2 + bx + c[/itex] but how do I do it for something like this with more than one variable?

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# Homework Help: Completing the square

**Physics Forums | Science Articles, Homework Help, Discussion**