Question

Find the inverse of the following matrix:

`[(1,-1),(2,3)]`

Answer 1

Let A =`[(1,-1),(2,3)]`

∴ |A| = 3 + 2 = 5

adj A = `[(3,1),(-2,1)]`

`"A"^-1 = 1/|"A"|` adj A = `1/5[(3,1),(-2,1)]`