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If y=2 is directrix and (0,1) be the ver...

If `y=2` is directrix and `(0,1)` be the vertex of parabola `x^(2)+lamday+mu=0` then, `(lamda-mu)=`?

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The correct Answer is:
8
`:' x^(2)=-4(y-1)` has directrix
`y-1+1`
`y=2`
`: lamda=4`
`mu=-4`
`lamda-mu=8`
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