One of the most important skills that students need to learn is How to find the determinant of a 3 by 3 matrix.

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To work out the determinant of a 3×3 matrix: Multiply a by the determinant of the 2×2 matrix that is not in a's row or column. Likewise for b, and for c; Sum them up, but remember the minus in front of the b; As a formula (remember the

The standard formula to find the determinant of a 3×3 matrix is a break down of smaller 2×2 determinant problems which are very easy to handle. If you need a refresher, check out my