Question

Check whether the following matrix is invertible or not:

`((1,0),(0,1))`

Answer 1

Let A = `((1,0),(0,1))`

Then, |A| = `|(1,0),(0,1)| = 1 - 0 = 1 ≠ 0.`

∴ A is a non-singular matrix.

Hence, A^-1 exists.