1.

Find the focus, equation of directrix and length of lactus rectum of x2 + 16y = 0

Answer»

x2 = -16y Comparing with 

x2 = -4ay we get 4a = 16 ⇒ a = 4 

∴ Focus = S = (0,-4) 

Directrix is y = -4. 

Length of L.R = 4a = 16.



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