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OpenStudy (anonymous):
What is the length (magnitude) of the vector (2,-1)?
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OpenStudy (anonymous):
Magnitude is just \[ \sqrt{x^2+y^2}\]
OpenStudy (anonymous):
the answers are 1 sqrt.5 aqrt. 2 and -2
OpenStudy (anonymous):
@iambatman
OpenStudy (anonymous):
So evaluate it, you have the "formula" what do you get?
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