Question

Check whether the following matrix is invertible or not:

`((1,2),(3,3))`

Answer 1

Let A = `((1,2),(3,3))`

Then, |A| = `|(1,2),(3,3)| = 3 - 6 = - 3 ≠ 0`

∴ A is a non - singular matrix.

Hence, A^-1 exists.