Use the Dot Product to Find the Magnitude of U $\mathbf { u } = - 5 \mathbf { i } - 2 \mathbf { j }$

question 45

Multiple Choice

Use the dot product to find the magnitude of u if $\mathbf { u } = - 5 \mathbf { i } - 2 \mathbf { j }$

• A) \(\| \mathbf { u } \| =\) 10
• B) \(\| \mathbf { u } \| =\) \(2 \sqrt { 29 }\)
• C) \(\| \mathbf { u } \| = 7\)
• D) \(\| \mathbf { u } \| = 15\)
• E) \(\| \mathbf { u } \| =\) \(\sqrt { 29 }\)

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