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y^(2)=-8x...

`y^(2)=-8x`

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Given equation `y^(2)=-8x`
Comparing with `y^(2)=-4ax`
`4a=8" "rArr" "a=2`
`:. "Coordinates of focus"-=(-a,0)-=(-2,0)`
Axis of parabola of directrix : `x-a=0" "rArr" "a-2=0`
Length of latus rectum `=4a=4xx2=8`
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