Use the Dot Product to Find the Magnitude of U $\mathbf { u } = \langle 2 , - 9 \rangle$

question 288

Multiple Choice

Use the dot product to find the magnitude of u. $\mathbf { u } = \langle 2 , - 9 \rangle$

• A) \(\sqrt { 89 }\)
• B) \(\sqrt { 83 }\)
• C) \(\sqrt { 85 }\)
• D) \(9\)
• E) \(\sqrt { 87 }\)

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