Determine the Values of C Such That $\| c u \| = 9$

question 211

Multiple Choice

Determine the values of c such that $\| c u \| = 9$ ,where $\mathbf { u } = \mathbf { i } + 8 \mathbf { j } + 9 \mathbf { k }$ .

• A) \(\pm 10 \sqrt { 146 }\)
• B) \(\frac { 9 } { 146 }\)
• C) \(\pm \frac { 10 \sqrt { 146 } } { 146 }\)
• D) \(- \frac { 9 } { 146 }\)
• E) \(\pm \frac { 9 \sqrt { 146 } } { 146 }\)

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