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19 December, 15:22

Let u = (5,12) and c=-3. what is ||cu||

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  1. 19 December, 18:43
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    ||cu|| = |c| * |u| = c[ magnitude of vector sum of 5i + 12j ] = 3sqrt (5^2 + 12^2)

    = 3sqrt (169) = 3 (13) = 39 (answer)
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