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Q.

A = (–2, 0) and P is a point on the parabola y2 = 8x. If Q bisects AP¯ and the locus of Q is a parabola then its focus is

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a

(1,1)

b

(4,0)

c

(0,0)

d

(5,0)

answer is A.

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Detailed Solution

Given parabola y2=8x4a=8a=2A=(2,0);P=2t2,4tGiven Q=Mid point of AP(x,y)=2+2t22,4t2(x,y)=t21,2tx=t21,y=2ty2=4t2y2=4(x+1)focus=(h+a,k)=(0,0)

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A = (–2, 0) and P is a point on the parabola y2 = 8x. If Q bisects AP¯ and the locus of Q is a parabola then its focus is