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QJEEM24Mac7f1: JEE Main 2024 Mathematics - Class 11 JEEM24Mac7f1 Solution: Let a conic C pass through the point ( 4 , − 2 ) and P ( x , y…

Let a conic C pass through the point (4,−2) and P(x,y),x≥3, be any point on C. Let the slope of the line touching the conic C only at a single point P be half the slope of the line joining the points P and (3,−5). If the focal distance of the point (7,1) on C is d, then 12d equals ________.

Step-by-Step Verified Solution

As per given condition

dydx=y+52(x−3)⇒ln⁡(y+5)=12ln⁡(x−3)+c Passes through (4,−2)⇒ln⁡3=12ln⁡1+c⇒c=ln⁡3

⇒ Curve is (y+5)2=9(x−3)

Focal distance of (7,1)=94+4=254=d

12d=75

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