The circles x^2 + y^2 = 4 and x^2 + y^2 – 8x + 12 = 0 touch each other, then the equation of their common tangent at the point where they touch,
The circles x2 + y2 = 4 and x2 + y2 – 8x + 12 = 0 touch each other, then the equation of their common tangent at the point where they touch, is given by
(1) x = – 2
(2) y = 2
(3) x = 2
(4) y = – 2
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