Determinant

[lldk]

How to solve part b)? I have tried to use part a), but it seems does not work. For example, (A+I)^-1=(A-(-I))^-1=A^-1 + A^-1[(-I)^(-1)-A^-1]A^-1

 

[blamocur]

Try multiplying the expression in question by [imath]A^{-1}[/imath].

 

[lldk]

Try multiplying the expression in question by [imath]A^{-1}[/imath].

you mean multiply A^-1 to the expression in a)?

 

[blamocur]

you mean multiply A^-1 to the expression in a)?

I mean the last expression in b).

 

[lldk]

I mean the last expression in b).

Got it! Thx!!!