Find the Magnitude $\mathbf { u } = \langle - 1,2 \rangle$

question 138

Multiple Choice

Find the magnitude.
-Let $\mathbf { u } = \langle - 1,2 \rangle$ . Find the magnitude (length) of the vector: $7 \mathbf { u }$ .

• A) \(7 \sqrt { 10 }\)
• B) \(- 7 \sqrt { 5 }\)
• C) \(7 \sqrt { 5 }\)
• D) \(\sqrt { 10 }\)

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