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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