Question

Find u*v if u=14j and v=i+4j

Answer 1

`\vec{u}` and
`\vec{v}` are vectors and:


`\vec{u}=14j=0i+14j=[0,14]\\\\ \vec{v}=i+4j=1i+4j=[1,4]`


`\vec{u}\cdot\vec{v}` is the dot product or scalar product, so:


`\vec{u}\cdot\vec{v}=[0,14]\cdot[1,4]=0\cdot1+14\cdot4=56`

Correct answer is A.