If the circles \[{{x}^{2}}+{{y}^{2}}-9=0\]and \[{{x}^{2}}+{{y}^{2}}+2ax+2y+1=0\] touch each other, then a = [Roorkee Qualifying 1998]

If the circles \[{{x}^{2}}+{{y}^{2}}-9=0\]and \[{{x}^{2}}+{{y}^{2}}+2a

1.	If the circles \[{{x}^{2}}+{{y}^{2}}-9=0\]and \[{{x}^{2}}+{{y}^{2}}+2ax+2y+1=0\] touch each other, then a = [Roorkee Qualifying 1998]
A.	- 4/ 3
B.	0
C.	1
D.	4/3
Answer» E.

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If the circles \[{{x}^{2}}+{{y}^{2}}-9=0\]and \[{{x}^{2}}+{{y}^{2}}+2ax+2y+1=0\] touch each other, then a = [Roorkee Qualifying 1998]

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