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If (18, 12) is one end of a double ordinate of $y^{2} = 8 x$ then equation of double ordinate is

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$y + 12 = 0$

$x + 18 = 0$

$x = 18$

$y = 12$

answer is A.

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Detailed Solution

$y^{2} = 8 x$

$\Rightarrow 4 a = 8 \Rightarrow a = 2 e n d p o i n t s o f d o u b l e o r d i n a t e a r e (18, 12) a n d (18, - 12) S o, e q u a t i o n o f d o u b l e o r d i n a t e i s x = 18$

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