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1-classify the quatric in R^3 with the equation , then determine the center of each. -3...

1-classify the quatric in R^3 with the equation , then determine the center of each.

-3 x2 +7y2 +72x +126y +z +95=0

2- prove that the quadric surface E with equation is a hyperbolic paraboloid. Determine its center

y - yz =xz

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