Question
Find the determinants of the matrices $A$ and find out which of these matrices are invertible.$$\left[\begin{array}{ll}1 & 4 \\2 & 8\end{array}\right]$$
Step 1
The determinant of a 2x2 matrix is calculated as the product of the elements on the main diagonal minus the product of the other two elements. The main diagonal elements are 1 and 8, and the other two elements are 2 and 4. Show more…
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