Let a line be a tangent to the hyperbola . If is also a tangent to the parabola , then is equal to :
- (A)24
- (B)-24✓ Correct
- (C)-12
- (D)12
Answer: (B)
Solution
A line touches when . Here is , so and gives , making . A line touches when . Writing as , the tangency condition reads
so .
so .
JEE Main · 2021 · 22 Jul 2021 · Shift 2 · Single correct option