Question: In exercise 15 through 28, classify the quadric surface given by each equation and determine its standard form? 1. -x2 -y2 - z2 + 4xy

In exercise 15 through 28, classify the quadric surface given by each equation and determine its standard form?
1. -x2 -y2 - z2 + 4xy + 4xz + 4yz = 3
2. 4x2 + 4y2 + 8z2 + 4xy - 4xz - 4yz + 6x - 10y + 2z = 9/4
3. x2 + y2 - 2z2 + 2xy + 8xz + 8yz + 3x + z = 0

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