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Let \(\mathbf{a}\) and \(\mathbf{b}\) be vectors such that  \(\|\mathbf{a}\| = 5,\)\(\|\mathbf{a} + \mathbf{b}\| = 7,\)and\(\|\mathbf{a} - \mathbf{b}\| = 9.\) Find \(\|\mathbf{b}\|.\)

 Aug 20, 2020
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The magnitude of vector v is 5*sqrt(3).

 Aug 28, 2020

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