JEE Main 2019 Mathematics question
The length of the perpendicular from the point (2, −1, 4) on the straight line, is:
Answer: (A)
Solution
Foot B(10λ−3, −7λ+2, λ); perpendicularity gives λ = 1/2, B(2, −3/2, 1/2); AB = .
The length of the perpendicular from the point (2, −1, 4) on the straight line, is:
Foot B(10λ−3, −7λ+2, λ); perpendicularity gives λ = 1/2, B(2, −3/2, 1/2); AB = .