Question: In Example 5, in A change 2 to 2 and 3 to 3, in B change 2 to 2 and 3 to 3, and then
In Example 5, in A change −2 to 2 and −3 to 3, in B change 2 to −2 and 3 to −3, and then do the multiplications.
Data from Example 5
For the given matrices A and B, show that AB = BA = I, and therefore that B = A−1.
![A = [ 1 -2 3 7 1 B | }] 73](https://dsd5zvtm8ll6.cloudfront.net/si.question.images/images/question_images/1680/1/6/2/71364253f996f4211680162713194.jpg){kind=small}
Forming the products AB and BA, we have the following:
Since AB = I and BA = I, B = A−1 and A = B−1.
A = [ 1 -2 3 7 1 B | }] 73 2 1
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