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Question

The ends of a line segment are P(1,3) and Q(1,1). R is a point on line segment PQ such that PR:QR=1:λ. If R is an interior point of parabola y2=4x, then

A
λ(0,1)
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B
λ(35,1)
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C
λ(12,35)
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D
none of these
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Solution

The correct option is B λ(0,1)

Let the coordinates of R be (α,β).

α=λ(1)+1λ+1=1, β=3λ+1λ+1

For R to be an interior point of the given parabola y2=4x,

β24α<0

(3λ+1λ+1)24<0

(3λ+1λ+1+2)(3λ+1λ+12)<0

(5λ+3)(λ1)<0

35<λ<1

But λ>0 ( R is a point on the line segment PQ)

Hence, λ(0,1)


Hence, option A.


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