Determine whether the vectors u and v are parallel, orthogonal, or neither. u = , v =

Question

Determine whether the vectors u and v are parallel, orthogonal, or neither. u = <1, -2>, v = <-4, 8>

anonymous · Answer

They're parallel.
The "gradient"=y/x=-2 for both vectors.

ipwnbunnies · Answer

A test for orthogonal is to take the dot product of the two vectors. If the dot product equals 0, then the two vectors are orthogonal.

anonymous · Answer

$$u=1i-2j,v=-4i+8j$$
$$u.v=\left( i-2j \right).\left( -4i+8j \right)=1\left( -4 \right)+\left( -2 \right)\left( 8 \right)$$
=-4-16
$$=-20\neq 0$$
hence they are not orthogonal.

ipwnbunnies · Answer

Just saying lol.

anonymous · Answer

thnk u lool

anonymous · Answer

i hve another question
Write the complex number in the form a + bi. 

6(cos 330° + i sin 330°)

anonymous · Answer

For a unit circle: 330 degrees is basically 330-360=-30 degrees. 
Now I think you can do the rest.  :D