3x3 Matrix Determinant 8 4 3 -5 6. -2 [7 9. -8 Find the determinant of the matrix using the formulas in number 1 then check your answer with shortcut solution in number 2: For n22, det(A) = a Cy = a,,G + az,C + + a C (for j = 1,2,3,.,or n) det(A) =a, Cy = a,G1 + a„Cz + *+ aCin (for i = 1,2,3, .- , or n) 1-1 Cy = co - factor of a, 1. A = |a21 a23 21 a22

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