can be taken as, Q≡{(1−3µ),(µ−1),(5µ+2)} gives
→
PQ
={−3µ−2,µ−3,5µ−4} Now, the
→
P
Q must be perpendicular to the normal for the given plane. 1(−3µ−2)−4(µ−3)+3(5µ−4)=0 ⇒−3µ−2−4µ+12+15µ−12=0 ⇒8µ=2 ⇒µ=‌