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For example:

Suppose vector $u = (-2,3)$ and

vector $v = (-5,3)$ then:

$(u + v = ?)$ and

$(u - v = ?)$ and

$(v - u = ?)$ and

$(6u = ?)$ and

$(-1/8v = ?)$ and

$(3u - 4v = ?)$

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    You have been posting for at least two months, have posted seven questions, and accepted none of the replies you have received. Not very community-minded...2011-01-25
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    Before you decide to go ad hominem on another person, please be correct. I have been thankful and happy with many answers I've received. If you have a personal pique against how I word questions or responses, please keep it to yourself unless there's a way to message me personally or you're going to contribute to the community with your response. Other students, who are striving to learn, will ask similar questions. Pertinent responses from other users are ideal.2011-01-25
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    Please see the final paragraph in the faq under **How do I ask questions here?** "Accepting" an answer is the formal acceptance of the answer you find most helpful in response to your questions. It involves marking the check-mark next to that answer which you find most helpful/useful. You can only accept one answer per question, in case Apostolos reply did not make that clear. Also: "ad hominem" is not a synonym for "personal insult"; it's a very specific kind of rhetorical fallacy. As it happens, I did neither.2011-01-25

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