Parabola and a Line

IMPORTANT

Parabola and a Line: Overview

This topic covers concepts, such as, Parabola and a Line, Position of a Line with Respect To a Parabola, Chords of the Parabola & Equation of Chord Joining Two Points of Parabola etc.

Important Questions on Parabola and a Line

MEDIUM
IMPORTANT

Equation of chord of the parabola y2=16x whose midpoint is 1,1 is

HARD
IMPORTANT

Slope of the chord of parabola y2=4ax which passes through the point -6a, 0 and which subtends an angle of 45° at the vertex, is

MEDIUM
IMPORTANT

Let a parabola be x2=4y. Then the image of the parabola formed by the line mirror x+y=2, is

MEDIUM
IMPORTANT

The line y=6x+1 touches the parabola y2=24x. The coordinates of a point P on this line from which the tangent to y2=24x is perpendicular to the line y=6x+1 is

HARD
IMPORTANT

From the focus of the parabola, y2=8x as centre, a circle is described so that a common chord of the curves is equidistant from the vertex & focus of the parabola. Find the equation of the circle.

HARD
IMPORTANT

Through the vertex O of the parabola y2=4ax, variable chords OP and OQ are drawn at right angles. If the variabte chord PQ intersects the axis of x at R, then prove that distance OR is equal to latus rectum of the parabola.

HARD
IMPORTANT

If the line 2y=-4x+11 is a tangent to the parabola (y-β)2=4(x-α) with x=1 as directrix, then the value of β is

HARD
IMPORTANT

An equilateral triangle ABC is inscribed in the parabola y=x2 and one of the sides of the equilateral triangle has the gradient 2. If the sum of x -coordinates of all the vertices of the triangle is expressed in the form of pq (where p & q are coprime natural number), then the value of  p-q is

HARD
IMPORTANT

A straight line is drawn through the point P(3,1) at an angle of 60° with the positive direction of the x- axis to cut the parabola y2=8x at the points A and B. If the value of |PA-PB|=a-b3, then a+b=

HARD
IMPORTANT

A line 2 x-y+8=0 passing through P-8,-8 cuts parabola y=x2+x-2 at A & B. Then which is false ?

HARD
IMPORTANT

A line through the origin intersects the parabola 5y=2x2-9x+10 at two points whose x-coordinates add up to 17. Then the slope of the line is :

HARD
IMPORTANT

From the point P4,0 the tangents PA and PB are drawn to the circle x2+y2=4. If point Q lies on the circle, then the square of the maximum area (in sq. units) of QAB is equal to

MEDIUM
IMPORTANT

The vertices of the base of an isosceles triangle lie on a parabola y2=4x and the base is a part of the line y=2x-4 . If the third vertex of the triangle lies on the x -axis, its coordinates are

MEDIUM
IMPORTANT

If P is a point on the parabola y2=8x and A is the point 1, 0, then the locus of the midpoint of the line segment AP is

EASY
IMPORTANT

If a,b and c form a geometric progression with common ratio r, then the sum of the ordinates of the points of intersection of the line ax+by+c=0 and the curve x+2y2=0 is

MEDIUM
IMPORTANT

If Px1, y1 is a point on the ellipse b2 x2+a2y2=a2b2 then the area of ΔSPS=

HARD
IMPORTANT

Chords of an ellipse are drawn through the positive end of the minor axis. Then locus of mid point of chords must be

HARD
IMPORTANT

Equation of chord of the parabola y2=16x whose mid point is (1,1), is

HARD
IMPORTANT

The mirror image of the directrix of the parabola y2=4(x+1) in the line mirror x+2y=3, is

MEDIUM
IMPORTANT

In the parabola y2=4ax, the length of the chord passing through the vertex inclined to its axis at π4 is