circle

Question: The equation of a circle passing through origin and co-axial to circles ${{x}^{2}}+{{y}^{2}}={{a}^{2}}$ and ${{x}^{2}}+{{y}^{2}}+2ax=2{{a}^{2}},$ is

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

2) ${{x}^{2}}+{{y}^{2}}+2ax=0$

3) ${{x}^{2}}+{{y}^{2}}-2ax=0$

4) ${{x}^{2}}+{{y}^{2}}=2{{a}^{2}}$

Solution:

Explanation: No Explanation

System of circles

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