# A qustion that my solution differs from the answer of the book

1. Mar 9, 2008

2. Mar 9, 2008

### HallsofIvy

Staff Emeritus
You are misreading the question. They are not asking you to find vector v such that T-1= b. The "-1" is a sub script, not superscript. They have defined Ta and asked you to solve T-1v= b. In other words, Ta with a= -1. Just row reduce the augmented matrix with A itself,, not A inverse.

By the way, if they were asking you to solve A-1v= b when they had given you A, you certainly should not find A-1 and then solve the equation! If you know A, the you know that AA-1v= v= Ab. Just multiply vector b by A.