Q.

The locus of a point which divides the join of A(–1, 1) and  a  variable  point  P  on  the circle x2+y2=4 in the ratio 3 : 2 is

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a

25(x2+y2)+20(x+y)+28=0

b

25(x2+y2)−20(x+y)+28=0

c

25(x2+y2)+20(x−y)+28=0

d

25(x2+y2)+20(x−y)−28=0

answer is D.

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Detailed Solution

Let any point on the circle be P rcosθ,rsinθ  If A(-1,1) =(x1,y1)    P 2cosθ, 2sinθ =(x2,y2)  and m:n=3:2 then (x,y) =6cosθ-25,6sinθ+25  5x=6cosθ−25y=6sinθ+2⇒25(x2+y2)+20(x−y)−28=0
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The locus of a point which divides the join of A(–1, 1) and  a  variable  point  P  on  the circle x2+y2=4 in the ratio 3 : 2 is