Let P be the parabola, whose focus is (−2,1) and directrix is 2x+y+2=0. Then the sum of the ordinates of the points on P , whose abscissa is -2 , is
(A)23✓ Correct
(B)25
(C)41
(D)43
Answer: (A)
Solution
A point of the parabola is equidistant from the focus (−2,1) and the directrix 2x+y+2=0, so (x+2)2+(y−1)2=5(2x+y+2)2. Putting the abscissa x=−2 makes the directrix expression 2(−2)+y+2=y−2, so 5(y−1)2=(y−2)2. Expanding gives 4y2−6y+1=0, whose two roots are the required ordinates, and their sum is 46=23.
JEE Main · 2025 · 07 Apr 2025 · Shift 1 · Single correct option