1.

The points on parabola y^2=12x whose focal distance is 4 are?

Answer»

The coordinate will be : (3, 6), (3, -6)

Explanation:

As we know that coordinates of the focus of parabola with equation y2=4ax are (a,0).

The focal distance of this parabola is 2a.

Here, y2 = 12x when we compare it to y2 = 4ax then
4a = 12 
a = 3
we can say the points lie on point of intersection of latus rectum and the parabola, so we put x = 3
we get y2 = 36 
y = ±6

so coordinates are (3, 6), (3, -6)



Discussion

No Comment Found

Related InterviewSolutions