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JEE Advanced · Mathematics · 14. Ellipse

Columns 1, 2 and 3 contain conics, equations of tangents to the conics and points of contact, respectively.
 
Column 1 Column 2 Column 3
(I) x2+y2=a2 (i) my=m2x+a (P) am2,2am
(II) x2+a2y2=a2 (ii) y=mx+a m2+1 (Q) -mam2+1,am2+1
(III) y2=4ax (iii) y=mx+ a2m2-1 (R) -a2ma2m2+1,1a2m2+1
(IV) x2-a2y2=a2 (iv) y=mx+a2m2+1 (S) -a2ma2m2-1,-1a2m2-1
For a=2 , if a tangent is drawn to a suitable conic (Column 1) at the point of contact -1, 1 , then which of the following options is the only Correct combination for obtaining its equation?

  1. A (II) (ii) (Q)
  2. B (III) (i) (P)
  3. C (I) (ii) (Q)
  4. D (I) (i) (P)
Verified Solution

Answer & Solution

Correct Answer

(C) (I) (ii) (Q)

Step-by-step Solution

Detailed explanation

For a= 2  and point (-1, 1) only I of column-1 satisfies. Hence, equation of tangent is -x+y=2 or  y=x+2    m=1  which matches with (ii) of column 2 and also with Q of column 3
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