If the line y=mx+a meets the parabola `x^(2)=4ay` in 2 points whose abscissae are `x_(1) and x_(2)` such that `x_(1)+x_(2)=0` then m=

If the line y=mx+c touches the parabola y^(2)=4a(x+a) , then

If the tangents at the extremities of a focal chord of the parabola x^(2)=4ay meet the tangent at the vertex at points whose abcissac are x_(1) and x_(2) then x_(1)x_(2)=

If the line y=mx+1 is tangent to the parabola y^(2)=4x, then find the value of m .

if the line 4x+3y+1=0 meets the parabola y^(2)=8x then the mid point of the chord is

The length of the subtangent to the parabola y^(2)=16x at the point whose abscissa is 4, is

The two parabolas y^(2)=4x" and "x^(2)=4 intersect at a point P, whose abscissas is not zero, such that