Find U × V and Show That It Is Orthogonal

question 109

Multiple Choice

Find u × v and show that it is orthogonal to both u and v.
$\begin{array} { l } \mathbf { u } = \frac { 5 } { 7 } \mathbf { i } \\\mathbf { v } = \frac { 6 } { 7 } \mathbf { j } - 49 \mathbf { k }\end{array}$

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