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OpenStudy (kj4uts):
Evaluate the dot product of (2,4) and (1,-2). Is this right 2(1)+4(-2) =2-8=-6?
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OpenStudy (anonymous):
Yes, and you can even verify http://www.wolframalpha.com/input/?i=%282%2C4%29+dot+product+%281%2C-2%29
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