how to find inverse?

Amandeep1
Tue, 24 Jun 2008 01:37:25 +0000

hi i am taking a sat prep course and i was given this problem

http://i18.■■■■■■■■■■■■■■■/albums/b147/Amand33p1/q1.jpg

can someone please explain how to solve this?

many thanks