How do you use the adjoint method?
If 𝐴 is an invertible matrix, then its inverse is 𝐴 = 1 ( 𝐴 ) ( 𝐴 ) , d e t a d j where a d j ( 𝐴 ) is the adjoint of 𝐴 and d e t ( 𝐴 ) is the determinant of 𝐴 . We note that this formula applies to square matrices of any order, although we will only use it to find 3 × 3 inverses here.
If 𝐴 is an invertible matrix, then its inverse is 𝐴 = 1 ( 𝐴 ) ( 𝐴 ) , d e t a d j where a d j ( 𝐴 ) is the adjoint of 𝐴 and d e t ( 𝐴 ) is the determinant of 𝐴 . We note that this formula applies to square matrices of any order, although we will only use it to find 3 × 3 inverses here.
