3. Rewrite each equation below in standard form of a quadric surface and then roughly sketch the sur- face. The sketch should be oriented correctly with the axes, the geometric centre shoukd be given, and the dimensions should be given where appropriate. i) 6 -+ 2y – 4y – 4: =0 (ii) 42 + 16r + y² – 4y + 4z² – 24: = -52

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