Could someone please explain how to go about putting an equation in to quadratic form.(adsbygoogle = window.adsbygoogle || []).push({});

e.g:

Q(x,y,z)=7x^2-2y^2-40z^2-14xz+20yz.

I know it equals 7(x-z)^2 -2(y-5z)^2 +3z^2. dnt know how to get there though.

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# Putting an equation in quadratic form

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