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  4. The radical axis of the circles x2+y2+4 x=1 and 4 x2+4 y2=9 is

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Q. The radical axis of the circles $x^{2}+y^{2}+4 x=1$ and $4 x^{2}+4 y^{2}=9$ is

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Solution:

$16 x=4-9$
$ \Rightarrow 16 x=5$