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If the line x-1=0 is the directrix of th...

If the line `x-1=0` is the directrix of the parabola `y^2-k x+8=0` , then one of the values of `k` is `1/8` (b) 8 (c) 4 (d) `1/4`

A

`1//8`

B

8

C

4

D

`1//4`

Text Solution

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The correct Answer is:
C
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MOTION-PARABOLA-EXERCISE - I
  1. Which one of the following equations represents parametrically, parabo...

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  2. The point of intersection of the curve whose parametrix equations are ...

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  3. If the line x-1=0 is the directrix of the parabola y^2-k x+8=0 , then ...

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  4. let P be the point (1, 0) and Q be a point on the locus y^2= 8x. The l...

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  5. Let N be the foot of perpendicular to the x-axis from point P on the p...

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  6. The locus of the midpoint of the segment joining the focus to a moving...

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  7. If (t^2, 2t) is one end ofa focal chord of the parabola, y^2=4x then ...

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  8. Find the locus of the point of intersection of the perpendicular ta...

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  9. Find the common tangent of x^(2) + y^(2) = 2a^(2) and y^(2) = 8ax.

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  10. The tangents to the parabola x = y^2 + c from origin are perpendicular...

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  11. T P and T Q are tangents to the parabola y^2=4a x at Pa n dQ , respect...

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  12. P Q is a normal chord of the parabola y^2=4a x at P ,A being the verte...

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  13. The normal at the point (bt1^2, 2bt1) on the parabola y^2 = 4bx meets ...

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  14. Locus of the intersection of the tangents at the ends of the normal ch...

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  15. If the normal chhord of the parabola y^(2)=4x makes an angle 45^(@) wi...

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  16. If x+y=k is normal to y^2=12 x , then k is 3 (b) 9 (c) -9 (d) -3

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  17. Tangents are drawn from the points on the line x-y+3=0 parabola y^2=8x...

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  18. The line 4x-7y + 10 = 0 intersects the parabola, y^2 = 4x at the point...

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  19. From the point (4, 6) a pair of tangent lines are drawn to the parabol...

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  20. PSQ is a focal chord of the parabola y^2=8xdotIf\ S P=6, then write SQ...

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