Linear algebra - Diagonalization

[Mister_F]

does someone know how to solve the following?

Homework Statement

"Find all matrices A so
I A
0 I
is Diagonalizable "

this is a picture of the matrice
http://i46.tinypic.com/258v514.jpg

How can I find A?

 

[who_]

What have you done so far? Please show your work so that we may know where you got stuck. If you are asking us to do the problem for you, then I'm afraid that is not allowed in this forum.