The equation of a common tangent to the parabolas and is
- (A)
- (B)✓ Correct
- (C)
- (D)
Answer: (B)
Solution
The equation of a tangent to with slope is .
For this to be tangent to , substitute:
For tangency, discriminant = 0:
, giving or .
For : .
For this to be tangent to , substitute:
For tangency, discriminant = 0:
, giving or .
For : .
JEE Main · 2022 · 26 Jul 2022 · Shift 2 · Single correct option