how to show -u = (-1) u ? in this question, u stands for a vector. i am not sure how to prove it because it seems so obvious. please help !
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Originally Posted by math beginner how to show -u = (-1) u ? in this question, u stands for a vector. i am not sure how to prove it because it seems so obvious. please help ! [-u,-u,-u] = (-1)*[u,u,u]