A) \[x+4=0\]
B) \[x-4=0\]
C) \[y-4=0\]
D) \[y+4=0\]
E) none of these
Correct Answer: A
Solution :
\[\because \]Focal chord of parabola\[{{y}^{2}}=ax\]is \[2x-y-8=0\] \[\because \]This chord passes through focus\[\left( \frac{a}{4},0 \right)\] \[\therefore \] \[2.\frac{a}{4}-0-8=0\] \[\Rightarrow \] \[a=16\] \[\therefore \]Directrix is\[x=-4\] \[\Rightarrow \] \[x+4=0\]You need to login to perform this action.
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