Pre-Calc question? (vectors in 3-D)?

it's me

New member
Determine whether u and v are orthogonal, parallel, or neither.

u = 3/4i - 1/2j +2k
v= 4i + 10j + k

Ok so I know that it's orthogonal if the equation equals zero. I can do this easily if the vector was 2-D but I'm having a brain fart right now and can't figure out this 3-D stuff.
 
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