3-d

Question: The equation of the sphere concentric with the sphere $2{{x}^{2}}+2{{y}^{2}}+2{{z}^{2}}-6x+2y-4z=1$and double its radius is

1) ${{x}^{2}}+{{y}^{2}}+{{z}^{2}}-x+y-z=1$

2) ${{x}^{2}}+{{y}^{2}}+{{z}^{2}}-6x+2y-4z=1$

3) $2{{x}^{2}}+2{{y}^{2}}+2{{z}^{2}}-6x+2y-4z-15=0$

4) $2{{x}^{2}}+2{{y}^{2}}+2{{z}^{2}}-6x+2y-4z-25=0$

Solution:

Explanation: No Explanation

Sphere

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