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Mathematics 7 Online
OpenStudy (anonymous):

(Vectors) If |x| = 11, |y|=23, and |x-y|=30, find |x+y|?

OpenStudy (anonymous):

you can use the parallelogram law: \[2|x|^2+2|y|^2=|x+y|^2+|x-y|^2\]

OpenStudy (anonymous):

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