Question

Axis of a parabola lies along x-axis. If its vertex and focus are at distances 2 and 4 respectively from the origin, on the positive x-axis then which of the following points does not lie on it? 

(1)   (4, –4)

(2)  (6, 4 √2)

(3)  (5, 2 √6)

(4)  (8, 6)

Answer 1

Correct option  (4)  (8, 6)

Explanation:

(y – 0)² = 4.2(x – 2)

y² = 8(x – 2)

Now check all options (8, 6) does not satisfy