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Matrices — Mathematics STD 10 — Question

ICSE BoardEnglish MediumSTD 10MathematicsMatrices3 Marks
Question
Evaluate the following $: \left|\begin{array}{ll} \mid 3 & 2 \end{array}\right|\left|\begin{array}{c} -1 \\ 3 \end{array}\right| $
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Answer

$\begin{array}{l}\left|\begin{array}{cc|c}\mid 3 & \left.2\right|_{1 \times 2} & -1 \\ 3\end{array}\right|_{2 \times 1} \end{array} $
$ =|3 \times-1+2 \times 3|  $
$ =|-3+6|  $
$ =|3|_{1 \times 1} $

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