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Let a, r, s, t be non-zero real numbers....

Let a, r, s, t be non-zero real numbers. Let `P(at^2, 2at), Q, R(ar^2, 2ar) and S(as^2, 2as)` be distinct points onthe parabola `y^2 = 4ax`. Suppose that PQ is the focal chord and lines QR and PK are parallel, where K isthe point (2a, 0). The value of r is

A

`-1/t`

B

`(t^(2)+1)/t`

C

`1/t`

D

`(t^(2)-1)/t`

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The correct Answer is:
D
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  14. The common tangents to the circle x^2 + y^2 =2 and the parabola y^2 = ...

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  15. Let a, r, s, t be non-zero real numbers. Let P(at^2, 2at), Q, R(ar^2, ...

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  17. Let P and Q be distinct points on the parabola y^(2) = 2x such that a ...

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