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Khan Academy
Khan Academy: Finding Inverses of Matrices: Nxn Determinant
Defining the determinant for nxn matrices. An exampled of a 4x4 determinant.
Khan Academy
Khan Academy: Finding Inverses of Matrices: Determinants Along Other Rows/cols
Finding the determinant by going along other rows or columns
Khan Academy
Khan Academy: Finding Inverses of Matrices: Example of Finding Matrix Inverse
Example of calculating the inverse of a matrix
Khan Academy
Khan Academy: Finding Inverses of Matrices: Formula for 2 X2 Inverse
Figuring out the formula for a 2x2 matrix. Defining the determinant.
Khan Academy
Khan Academy: Finding Inverses of Matrices: Rule of Sarrus of Determinants
A alternative "short cut" for calculating 3x3 determinants (Rule of Sarrus)