Question

Find the center C and the radius a for the sphere

1. 3x2 + 3y2 + 3z2 + 2y - 2z = 9

2. x2 + y2 + z2 - 4x + 6y - 10z = 11

3. (x - 1)2 + (y - 2)2 + (z + 1)2 = 103 + 2x + 4y - 2z

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