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A

`a_(1)a_(2) gt 0`

B

`a_(2)a_(2) lt 0`

C

`cgt0`

D

`cgt0`

Text Solution

Verified by Experts

The correct Answer is:
1,3
The equation of radical axis of the given circle is `x=0`
If one circle lies completely inside the other, the centers of both circles should lie on the same side of the radical axis and the radical axis shouls not intersect the circles. Therefore,
`( -a_(1))(-a_(2))=0`
or `a_(1)a_(20 gt 0`
Also, `y^(2)+c=0` should have imaginary roots, ie., `c gt0`
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