circle

Question: If the circles ${{x}^{2}}+{{y}^{2}}-9=0$ and ${{x}^{2}}+{{y}^{2}}+2ax+2y+1=0$ touch each other, then $a =$



1) – 4/ 3
2) 0
3) 1
4) 4/3
Solution: Explanation: No Explanation
System of circles

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