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

Question

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

anonymous · Answer

is it orthdontal?

anonymous · Answer

@wilfley !!! good to see you :)

anonymous · Answer

hey

anonymous · Answer

did i answer correctly?

anonymous · Answer

if two vectors are perpendicular (orthogonal), they will have a dot product of 0 i think...let me check

anonymous · Answer

my answer choices are :
Orthogonal

 Neither

 Parallel

anonymous · Answer

yeah, they aren't orthogonal because the dot product is -20 which of course isn't 0 lol

anonymous · Answer

they are parallel is the cross product of the two vectors is 0, lets see.

anonymous · Answer

sso it would be parrallel??

anonymous · Answer

$$\left[\begin{matrix}1 & -2 \ -4 & 8\end{matrix}\right]$$ (1*8)-[-4*(-2)] =0 so yeah, parallel

anonymous · Answer

thank you! and one more

anonymous · Answer

Write the complex number in the form a + bi. 

3(cos 60° + i sin 60°)

anonymous · Answer

is it 3/2+3sqrtof3/2i ???

anonymous · Answer

crap, I don't remember that one,  what is the chapter about?

anonymous · Answer

im not sure.. i cant leave the test

anonymous · Answer

is the i bold for a vector or regular for imaginary numbers?