Q.

Given that A≡(1,−1) and locus of B is x2+y2=16 . If P divides AB in the ratio 3:2 then locus of P is

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a

(x−2)2+(y−3)2=4

b

(x+1)2+(y−2)2=4

c

(x−3)2+(y−2)2=4

d

(3x+2)2+(3y−2)2=400

answer is D.

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Detailed Solution

Given point A(1,−1) and B lies on x2+y2=16 .  Let point B be (x,y) and point P be (h,k) . ∴ (x,y)=3h+25,3k−25 Now B lies on x2+y2=16∴ 3h+252+3k−252=16∴ (3x+2)2+(3y−2)2=400, which is required locus.
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