A line is a common tangent to the circle (x–3)2+y2=9 and the parabol – InterviewSolution

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1.	A line is a common tangent to the circle (x–3)2+y2=9 and the parabola y2=4x. If the two points of contact (a,b) and (c,d) are distinct and lie in the first quadrant, then 2(a+c) is equal to
Answer» A line is a common tangent to the circle $(x - 3)^{2} + y^{2} = 9$ and the parabola $y^{2} = 4 x$ . If the two points of contact $(a, b)$ and $(c, d)$ are distinct and lie in the first quadrant, then $2 (a + c)$ is equal to

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