Find all vector < 1, a, b> orthogonal to <4, -8, 2>.
This is what I got so far, but I'm not sure whether my process is correct or not.
let u = < 1, a, b> and v = <4, -8, 2>.
u*v = < 1, a, b> *<4, -8, 2>= 4-8a+2b
set 4-8a+2b= 0

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Your process if correct assuming you're using the dot product definition :)

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