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Use the Given Vectors to Find the Indicated Expression v=4i+2j3k,u=4i3j+4k\mathbf { v } = - 4 \mathbf { i } + 2 \mathbf { j } - 3 \mathbf { k } , \quad \mathbf { u } = - 4 \mathbf { i } - 3 \mathbf { j } + 4 \mathbf { k }

Question 253

Multiple Choice

Use the given vectors to find the indicated expression.
- v=4i+2j3k,u=4i3j+4k\mathbf { v } = - 4 \mathbf { i } + 2 \mathbf { j } - 3 \mathbf { k } , \quad \mathbf { u } = - 4 \mathbf { i } - 3 \mathbf { j } + 4 \mathbf { k }
Find v×(5u) \mathbf { v } \times ( - 5 \mathbf { u } ) .


A) 115i+155j50k115 \mathbf { i } + 155 \mathbf { j } - 50 \mathbf { k }
B) 5i140j100k5 \mathbf { i } - 140 \mathbf { j } - 100 \mathbf { k }
C) 5i+140j+100k- 5 \mathbf { i } + 140 \mathbf { j } + 100 \mathbf { k }
D) 1i0j+20k- 1 \mathbf { i } - 0 \mathbf { j } + 20 \mathbf { k }

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