Consider the matrix A = [[-3, 3, 1, 3], [1, -4, 0, -4], [1, -5, -1, 5], [1, 3, 1, -4]]. To find the det(A), set up the cofactor expansion of A along row 2:
*det(A_(2,1)) + *det(A_(2,2)) + â—»*det(A_(2,3)) + â—»*det(A_(2,4))
where:
A_(2,1) =
A_(2,2) =
A_(2,3) =