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To determine which of the given conicoids are central and which are non-central, and to identify if the central conicoids have their center at the origin, we will analyze the equations using the general form of a conicoid and apply the properties related to their center. ### (i) \( x^2 + y^2 + z^2 + 4x + 3y - z = 0 \) Step 1: Completing the square for each variable - For \( x^2 + 4x \), __________ _________ ____ _________ _____ ________ _________ __________.
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