Question

determinar o valor de m para que o vetor w=(1,2,m) seja simultaneamente ortogonal aos vetores v1=(2,-1,0) e V2=(1,-3,-1).

Answer 1

(2-1,0).(1,2,m)=0
2-2=0     

(1,2,m)*(1,-3,-1)=0
1-6-m=0

m=-5