Introduction To Conics And Parabola

The co-ordinates of the extremities of the latus rectum of the parabola 5y2=4x are 
A. (15.25),(−15,25)
B. (15.25),(15,−25)
C. (15.45),(15,−45)
D. None of these

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Answer: Option B
: B

y2=4.15x;a=15. Focus is (15,0) and co-ordinates of latus rectum are y2=425y=±25 or end points of latus rectum are (15,±25) .

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