Question

If the parabola y²= ax passes through ( 1,2) then the equation of the directrix is​

Answer 1

Step-by-step explanation:

Since, (y+1)2=a(x−2)) passes through (1,−2)

Therefore, (−1)2=a(1−2)

⇒a=−1

Therefore, equation of directrix

X+4a=0

 x−2−41=0

⇒4x−9=0

Answer 2

Answer:

answer is 0..............