Use the Dot Product to Find the Magnitude of U $\mathbf { u } = - 3 \mathbf { i } + 6 \mathbf { j }$

question 261

Multiple Choice

Use the dot product to find the magnitude of u if $\mathbf { u } = - 3 \mathbf { i } + 6 \mathbf { j }$

• A) \(\| \mathbf { u } \| = 18\)
• B) \(\| \mathbf { u } \| =\) \(6 \sqrt { 5 }\)
• C) \(\| \mathbf { u } \| = 18\).
• D) \(\| \mathbf { u } \| =\) \(3 \sqrt { 5 }\)
• E) \(\| \mathbf { u } \| = 23\)

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