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What is `x^(2)=-9y`

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`x^(2)=-9y`
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Given equation `x^(2)=-9y`
Comparing with `x^(2)=-4ay`,
`4a=9" "rArr" "a=(9)/(4)`
Coordinates of focus `-=(0,-a)-=(0,-(9)/(4))`
Axis of parabola : x=0
Equation of directrix : y-a=0
`rArr" "y-(9)/(4)=0`
`rArr" "4y-9=0`
Length of latus rectum =4a=9
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