Mister Exam

x2+y2+4z2−4yz−4x−8y=0. canonical form

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The solution

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x2 + y2 - 8*y - 4*x + 4*z2 - 4*y*z = 0
$$- 4 x + x_{2} - 4 y z - 8 y + y_{2} + 4 z_{2} = 0$$
-4*x + x2 - 4*y*z - 8*y + y2 + 4*z2 = 0