Use the Vectors U and V to Find U × $\mathbf { u } = 6 \mathbf { i } - \mathbf { j } + 7 \mathbf { k } \quad \mathbf { v } = 5 \mathbf { i } + 5 \mathbf { j } - \mathbf { k }$

Multiple Choice

Use the vectors u and v to find u × (2v) . $\mathbf { u } = 6 \mathbf { i } - \mathbf { j } + 7 \mathbf { k } \quad \mathbf { v } = 5 \mathbf { i } + 5 \mathbf { j } - \mathbf { k }$

A) $\mathbf { u } \times ( 2 \mathbf { v } ) = - 68 \mathbf { i } + 82 \mathbf { j } + 82 \mathbf { k }$
B) $\mathbf { u } \times ( 2 \mathbf { v } ) = - 68 \mathbf { i } + 82 \mathbf { j } + 70 \mathbf { k }$
C) $\mathbf { u } \times ( 2 \mathbf { v } ) = - 68 \mathbf { i } + 70 \mathbf { j } + 70 \mathbf { k }$
D) $\mathbf { u } \times ( 2 \mathbf { v } ) = 82 \mathbf { i } + 82 \mathbf { j } + 70 \mathbf { k }$
E) $\mathbf { u } \times ( 2 \mathbf { v } ) = 70 \mathbf { i } + 82 \mathbf { j } + 70 \mathbf { k }$