How to Find the Determinant of a Matrix
Calculate 2×2 and 3×3 determinants with ad − bc and cofactor expansion, learn what a zero determinant means, and see it as an area.
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How to Find the Inverse of a Matrix (2×2 and 3×3)
Find the inverse of a 2×2 matrix with the quick formula and of a 3×3 matrix by Gauss–Jordan elimination, and check it with A × A⁻¹ = I.