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I need help showing my work please Feit Exercise. Suppose u and v are vectors in a space R such that lul = 7, |v|

I need help showing my work please

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Feit Exercise. Suppose u and v are vectors in a space R" such that lul = 7, |v| = 3 and u.v = 4. 1. Find |2u + v|. 2. Find |u - 3v|. 3. Find AER such that (u - Av) IV

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