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[" angents to "11." The two circles "x^(...

[" angents to "11." The two circles "x^(2)+y^(2)-2x+6y+6=0" and "],[x^(2)+y^(2)-5x+6y+15=0" touch each other.The equation of "],[" their common tangent is "],[[" (a) "x=3," (b) "y=6],[" (c) "7x-12y-21=0," (d) "7x+12y+21=0]]

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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=13 (B) y=6 (C) 7x-12y-21=0 (D) 7x+12y+21=0

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

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