Long description

A 2 by 3 matrix is multiplied by a 4 by 2 matrix. First matrix. Row 1: 2 and 1. Row 2: negative 3 and 0. Row 3: 1 and 2. Second matrix. Row 1: negative 1, 6, 5, and negative 2. Row 2: 3, 0, 1, and negative 4.

The first row of the first matrix is multiplied by the first column of the second matrix. This becomes the first number of the answer matrix. The third row of the first matrix is multiplied by the second column of the second matrix. This becomes the third row, second column of the answer matrix.

The answer matrix is a 4 by 3 determinant. Row 1: 2 times negative 1 plus 1 times 3, 2 times 6 plus 1 times 0, 2 times 5 plus 1 times 1, and 2 times negative 2 plus 1 times negative 4. Row 2: negative 3 times negative 1 plus 0 times ...

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