Find the Length and Direction (When Defined) of U × $0 ; - 3 \mathbf { i } + 8 \mathbf { i } - 6 \mathbf { k }$

question 187

Multiple Choice

Find the length and direction (when defined) of u × v.
-u = -3i + 8i - 6k, v = 0

• A) \(0 ; - 3 \mathbf { i } + 8 \mathbf { i } - 6 \mathbf { k }\)
• B) \(0 ; \frac { 1 } { \sqrt { 109 } } ( - 3 \mathbf { i } + 8 \mathbf { i } - 6 \mathbf { k } )\)
• C) 0; no direction
• D) \(\sqrt { 109 } ; \frac { 1 } { \sqrt { 109 } } ( - 3 \mathbf { i } + 8 \mathbf { i } - 6 \mathbf { k } )\)

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