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#### Tonia

##### New member

- Jul 20, 2018

- 5

Find the cofactors of the elements in the second row of every determinant:

$$\begin{vmatrix}-2 & 0 & 1 \\ 1 & 2 & 0 \\ 4 & 2 & 1 \end{vmatrix}$$

I am going to guess that I need to look at each number in the second horizontal row to see what i and j are for finding the cofactors of the elements. I am a bit confused as to where to start this problem at. I am familiar with evaluating a 2X2 determinant but finding a cofactor of an element, evaluating a determinant, and understanding Cramer's Rule, is very confusing to me right now.

$$\begin{vmatrix}-2 & 0 & 1 \\ 1 & 2 & 0 \\ 4 & 2 & 1 \end{vmatrix}$$

I am going to guess that I need to look at each number in the second horizontal row to see what i and j are for finding the cofactors of the elements. I am a bit confused as to where to start this problem at. I am familiar with evaluating a 2X2 determinant but finding a cofactor of an element, evaluating a determinant, and understanding Cramer's Rule, is very confusing to me right now.

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