A) 10i + 2j + 11k
B) 10i + 3j + 11k
C) 10i ? 3j + 11k
D) 10i ? 3j ? 10k
Correct Answer: B
Solution :
\[\mathbf{a}\times \mathbf{b}=\left| \,\begin{matrix} \mathbf{i} & \mathbf{j} & \mathbf{k} \\ 2 & -3 & -1 \\ 1 & 4 & -2 \\ \end{matrix}\, \right|\]\[=\mathbf{i}(6+4)-\mathbf{j}\,(-4+1)+\mathbf{k}(8+3)\] \[=10\mathbf{i}+3\mathbf{j}+11\mathbf{k}.\]You need to login to perform this action.
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