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Questions  

If P is the point (1, 0) and Q lies on the parabola

y2=36x then the locus of the mid point of PQ is

a
y2=9(2x−1)
b
y2=9(x+2)
c
y2=2(x−9)
d
x2=9(y−2)

detailed solution

Correct option is A

Let the coordinates of Q be 9t2,18t coordinatesof R the mid point of PQ are 9t2+12,9t=(x,y)Locus of R is2x=9y92+1⇒y2=9(2x−1)

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