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Mathematics 20 Online
OpenStudy (anonymous):

Find the length of 2v if v = <2, -4, 5>

OpenStudy (anonymous):

Just multiply by 2 to get 2v = <4, -8, 10>. Then the length or magnitude is sqrt (4^2 + (-8)^2 + 10^2) = sqrt (180) = 6 sqrt(5)

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