Question
Question: Two perpendicular tangents to y<sup>2</sup> = 4ax always intersect on the line, if...
Two perpendicular tangents to y2 = 4ax always intersect on the line, if
A
x = a
B
x + a = 0
C
x + 2a = 0
D
x + 4a = 0
Answer
x + a = 0
Explanation
Solution
Two perpendicular tangents to y2 = 4ax always intersect on directrix
\ x = – a ̃ x + a = 0