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Question: How many common tangents can be drawn to the following circles x<sup>2</sup> + y<sup>2</sup> = 6x an...

How many common tangents can be drawn to the following circles x2 + y2 = 6x andx2 + y2 + 6x + 2y + 1 = 0

A

4

B

3

C

2

D

1

Answer

4

Explanation

Solution

C1(3, 0) r1 = 3

C2(–3, –1) r2 = 3

C1C2 = 36+1\sqrt { 36 + 1 } = 37\sqrt { 37 }

C1C2 > |r1 + r2|

Ž 4 common tangents