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The two circles x^2 + y^2 -2x+6y+6=0 and...

The two circles `x^2 + y^2 -2x+6y+6=0 and x^2 + y^2 - 5x + 6y + 15 = 0` touch eachother. The equation of their common tangent is

A

`x=3`

B

`y=6`

C

`7x-12y-21=0`

D

`7x+12y+21=0`

Text Solution

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The correct Answer is:
A
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Knowledge Check

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