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

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SUMMARY

The discussion clarifies a common misunderstanding regarding the notation used in linear algebra problems, specifically the interpretation of subscripts and superscripts. The correct interpretation of the problem involves solving the equation T-1v = b, where T-1 refers to a transformation defined by Ta with a = -1. Participants emphasize the importance of row reducing the augmented matrix directly with matrix A, rather than attempting to find the inverse of A. This approach streamlines the solution process and avoids unnecessary calculations.

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  • Familiarity with augmented matrices and row reduction techniques
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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.
 

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