Four Numbers in a Box

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Linear Algebra / Determinants - 2-3 min

Find the determinant of the matrix $A$ . The determinant is a single number, written $\det A$ .

A=\begin{pmatrix}3&1\\2&4\end{pmatrix}

Assumptions

Use the usual determinant of the displayed real two-by-two matrix; rows and columns are in the order shown.

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Collection question · Revision 1 · ID: determinant-two-by-two