Question
Find the determinants of the matrices $A$ and find out which of these matrices are invertible.$$\left[\begin{array}{lll}1 & 2 & 3 \\1 & 1 & 1 \\3 & 2 & 1\end{array}\right]$$
Step 1
We can use the rule of Sarrus to do this. The rule of Sarrus is a method for finding the determinant of a 3Ă—3 matrix. It involves adding the products of the diagonals going from the top left to the bottom right, and subtracting the products of the diagonals going Show more…
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