DR's of PM are (λ,−λ−3,2λ) PM⟂L ⇒λ+(−1)(−λ−3)+2(2λ)=0 ⇒6λ+3=0 ⇒λ=
−1
2
P(
1
2
,
−1
2
,1) Let another line L′:
x+1
1
=
y−1
−1
=
z+2
1
General point on line L′ is (µ−1,−µ+1,µ−2) Point of intersection of line L and L′ is λ+1=µ−12λ+2=µ−2 ⇒µ−λ=2....(1)⇒2λ=µ−4 ⇒λ=−2 and µ=0 Q(−1,1,−2) 2(PQ)2=2((
