\(13 \) Consider the vectors \( u = ( - 1,1 , - 1 ) \) and \( v = ( 3 , - 1,0 ) \) . Find i) the value of \( \alpha \) if \( s = ( 2,3 , \alpha ) \) is orthogonal to \( u \) . ii) the vector \( q \) that is in the opposite direction to \( v \) if \( \| q \| = \sqrt { 10 } \) .
Pregunta
Answer
i):-2+3-a=0
a=1
ii):(-3,1,0)
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