Q.

Let P(x, y) be a variable point such that (x−3)2+(y−2)2−(x−6)2+(y+2)2=3. Statement-1: P traces a hyperbola whose eccentricity is53.Statement-2: P traces a hyperbola such that the equation of its conjugate axis is 6x – 8y = 27

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a

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1

b

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1

c

STATEMENT-1 is True, STATEMENT-2 is False

d

STATEMENT-1 is False, STATEMENT-2 is True

answer is B.

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Detailed Solution

Distance of P from the fixed points F1(3, 2) and F2(6,−2) is constant 3.So by definition, locus of P is a hyperbola with foci  F1 and F2, length of the transverse axes is 3. If e is the eccentricity then F1F2=2ae where 2a=3. ⇒e=139+16=53 and the statement-1 is true.n statement-2 slope of the conjugate axis is −6−3−2−2=34 and it passes through the mid-point of F1F2 So its equation isy=34x−92⇒6x−8y=27Thus statement-2 is also true but does not lead to statement-1.
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