SOLUTION: Please help me solve this eqaution: give the determinant 5, 4, 2, 1, 7, 3, 4, -1, 1 (write the minor of element 3 and write down co-factor of element 3.

Question 962323: Please help me solve this eqaution: give the determinant 5, 4, 2, 1, 7, 3, 4, -1, 1 (write the minor of element 3 and write down co-factor of element 3.
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
give the determinant (write the minor of element and write down co-factor of element .
The minor of the in the row is the determinant which contains only the elements of determinant that are NOT in the same row or the same column (which is column ) as that .

The minor of that is this determinant:

=

As you can see, the minor for row and column is .

The cofactor is times minor ;so, it is

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