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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- May 21st 2008, 06:22 AMmath beginnerhow to show -u = (-1) u ?
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 ! - May 21st 2008, 06:46 AMcolby2152