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Length of the focal chord of the parabol...

Length of the focal chord of the parabola `(y +3)^(2) = -8(x-1)` which lies at a distance 2 units from the vertex of the parabola is

A

8

B

`6sqrt(2)`

C

9

D

`5sqrt(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
Lengths are invariant under change of axes. Consider `y^(2) = 8x`.
Focus is (2,0). So, focal chord at distance "2" than vertex is latus rectum which has length "8".
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