Which surface below is shaped like a saddle? O -x^2 + y^2 +z^2 = 1 O z = -x^2 + y^2 O y^2 - x^2 = 1 O z = -x^2 - y^2

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A: Steps and explanations are as follows: In case of any doubt, please let me know. Thank you.

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A: 4x^2 - 10x + 4y^2 + 9y - 5 = 0 Find (h,k) and the radius.