WBJEE 2018 Math Solved Paper

Equation of line joining points (0, –11, 4) and (2, –3, 1)

x−1

2

=

y+3

8

=

z−1

−3

=λ
DR's of PQ 2λ + 1, 8λ – 11, –3λ – 3
Now (2λ + 1)2 + (8λ – 11)8 + (–3λ – 3)(–3) = 0
77λ – 77 = 0 ‌‌‌‌‌‌ ⇒ ‌‌‌‌‌‌ λ = 1
Q(4, 5, –2) ‌‌‌ Ans. (D)