A. A
B. 2a
C. 4a
D. 8a
If the vertex of the parabola y = x2 – 8x + c lies on x – axis, then the value of c is
The equation of the parabola with latusrectum joining the points (6,7) and (6,-1) is
The locus of the point of intersection of two tangents to the parabola y2 = 4ax which intercept a constant length d on the directrix is
The equation of the parabola whose axis is parallel to y –axis and passing through (4, 5) (-2, 11), (-4, 21) is
The normal at P cuts the axis of the parabola y2 = 4ax in G and S is the focus of the parabola.If Δ SPG is equilateral then each side is of length
The vertex of a parabola is the point (a,b) and latusrectum is of length 1. If the axis of the parabola is along the positive direction of y – axis, then its equation is
The pole of the line 2x + 3y – 4 = 0 with respect to the parabola y2 = 4x is
The locus of the point of intersection of two tangents to the parabola y2 = 4ax which make an angle 300 with one another is
A box contains 10 mangoes out of which 4 are rotten. Two mangoes are taken out together. If one of them is found to be good, the probability that the other is also good is
The locus of the point of intersection of tangents to the parabola y2 = 4(x + 1) and y2 = 8(x+2) which are perpendicular to each other is