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Given u=5i3j\mathbf { u } = 5 \mathbf { i } - 3 \mathbf { j }

Question 208

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Given u=5i3j\mathbf { u } = 5 \mathbf { i } - 3 \mathbf { j } and v=i+2j\mathbf { v } = \mathbf { i } + 2 \mathbf { j } , determine 9u3v9 \mathbf { u } - 3 \mathbf { v } .


A) 9u3v=39i39j9 \mathbf { u } - 3 \mathbf { v } = 39 \mathrm { i } - 39 \mathrm { j }
B) 9u3v=3i+3j9 \mathbf { u } - 3 \mathbf { v } = 3 \mathbf { i } + 3 \mathbf { j }
C) 9u3v=42i33j9 \mathbf { u } - 3 \mathbf { v } = 42 \mathbf { i } - 33 \mathbf { j }
D) 9u3v=6i+39j9 \mathbf { u } - 3 \mathbf { v } = - 6 \mathbf { i } + 39 \mathbf { j }
E) 9u3v=30i+39j9 \mathbf { u } - 3 \mathbf { v } = - 30 \mathbf { i } + 39 \mathbf { j }

Correct Answer:

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