Question 417483
Hint: To show that vectors *[Tex \LARGE \vec{u}] and *[Tex \LARGE \vec{v}] are perpendicular, all you need to show is *[Tex \LARGE \vec{u}\cdot\vec{v}=0]. 


Recall that if *[Tex \LARGE \vec{u}=<a,b,c>] and *[Tex \LARGE \vec{v}=<d,e,f>], then *[Tex \LARGE \vec{u}\cdot\vec{v}=ad+be+cf]