1. Make a 3x3 matrix, first column should be the variables i, j, k. Second column should be the values of vector U. Third column should be the values of vector V.
2. Then take the first 2 rows of the matrix and rewrite them next to it.
3. Then you multiply the diagonal values going forward (see example below, it is the green portion), and add the values you get from that.
4. Then you multiply the diagonal values going backward (see example below, it is the purple portion), and subtract these values.
The shortcut to a 3x3 matrix is to put the first two rows on the other side of the bar. This is easier and efficient to get the answer. This is important to know because it will save you a lot of time.
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