circle

Question: The circles ${{x}^{2}}+{{y}^{2}}+4x+6y+3=0$ and $2({{x}^{2}}+{{y}^{2}})+6x+4y+C=0$ will cut orthogonally, if C equals



1) 4
2) 18
3) 12
4) 16
Solution: Explanation: No Explanation
System of circles

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