Question

u=4i+k and v= -1+2j + 2k ; find u*v

Answer 1

you mean dot product? or cross product ? (assuming i,j,k are unit vectors)

Answer 2

u*v, you mean ?

Answer 3

yeah,,that too

Answer 4

it doesn't say but i'm assuming dot product

Answer 5

well..treat dot product as simple multipication in this case..
remember i.i = j.j = k.k =1 and i.j=i.k=k.j=0
this should help you..