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The foci of an ellipse are S(-1,-1), S'(...

The foci of an ellipse are S(-1,-1), S'(0,-2) its e=1/2, then the equation of the directrix corresponding to the focus S is

Text Solution

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`2ae=sqrt2`
`a=sqrt2`
`OF=a/e=2sqrt2`
`OS=SS'/2=1/sqrt2`
`FS=2sqrt2-1/sqrt2`
`=3/sqrt2`
`y=mx+c`
`y-x-c=0`
...
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